Open Source & Free Tools for Web Workers

WebTUI est une bibliothèque CSS modulaire conçue pour transposer l'esthétique des Interfaces Utilisateur de Terminal (TUI) dans le navigateur.

Ses principales caractéristiques comprennent :

• Design TUI pour le Navigateur : Son objectif fondamental est d'apporter l'apparence et l'expérience des TUIs au web. Le design est décrit comme allant "HARD".

• Modularité : Il s'agit d'une bibliothèque CSS modulaire.

• Composants UI : La bibliothèque offre une variété de composants UI prêts à l'emploi, tels que Badge, Button, Checkbox, Dialog, Input, Popover, Pre, Radio, Separator, Switch, Table, Textarea, Tooltip, et Typography.

• Thématisation et Plugins : WebTUI supporte la thématisation via des variables CSS, des styles de police, des couleurs, et la gestion des modes clair et sombre. Il prend également en charge les plugins, notamment des plugins officiels pour des thèmes comme Catppuccin, Gruvbox et Nord, ainsi qu'un plugin Nerd Font. Des sections de documentation sont dédiées au développement de plugins et aux couches de style.

• Installation Flexible : La bibliothèque propose différentes méthodes d'installation et d'utilisation, notamment en utilisant CSS, ESM, un CDN, ou une importation complète de la bibliothèque. Des guides d'installation sont disponibles pour des frameworks comme Next.js, Vite et Astro.

• Guides et Documentation : La documentation couvre divers aspects tels que le changelog, une introduction, une section sur les fonctionnalités, la comparaison entre TUIs et GUIs, ainsi que des guides sur la contribution, un guide de style (unités CSS, sélecteurs, documentation), et le développement de plugins.

ALTCHA is a next-generation CAPTCHA and spam protection system. It offers a privacy-first, globally compliant, and accessible alternative to traditional CAPTCHAs.

Features:

• Privacy Compliance: ALTCHA protects against spam and abuse without tracking users. It is designed to be fully compliant with major data protection regulations worldwide, including GDPR, HIPAA, CCPA, PIPEDA/CPPA, LGPD, DPDPA, and PIPL. It uses no cookies, no tracking, and no external servers for core functions, ensuring user privacy.

• Accessibility: It is built with accessibility in mind, adhering to WCAG 2.2 Level AA guidelines and meeting requirements under the European Accessibility Act (EAA). This ensures it works with screen readers and assistive technologies.

• User Experience: ALTCHA aims to provide a frictionless and frustration-free experience for real users. It primarily uses a Proof-of-Work (PoW) verification method, eliminating the need for visual puzzles.

• Technology: It works quietly in the background, using machine learning and pattern recognition to block abuse. It offers adaptive protection that dynamically responds to emerging threats.

• Challenge Mechanisms: The system defaults to PoW. For cases flagged as high-risk, it escalates to a secure code challenge. This code challenge includes an audio component, which is also available in multilingual versions (48+ languages supported, including RTL).

• Robust Security Features (ALTCHA Sentinel): The advanced ALTCHA Sentinel platform offers a range of security features including Bot Detection, Proxy/TOR Detection, Email Verification, Rate Limiting, IP Reputation checks, IP Geo Fencing, Language Detection, Text Classification, and secure form submissions. It provides comprehensive protection.

• Self-Hosted and Customizable: ALTCHA is a self-hosted solution, giving users full control over their spam protection system. It is fully customizable, allowing tailoring of the challenge mechanism to specific needs while maintaining compliance.

• Open Source: The core ALTCHA widget and integration libraries are open-source under the MIT license, offering a free base solution. ALTCHA Sentinel is the optional commercial platform for enhanced security needs.

• Easy Integration: It offers straightforward integration with various languages, frameworks, and CMS platforms.

In essence, ALTCHA provides a secure, compliant, and user-friendly way to protect websites, apps, and services against spam, bots, and automated threats by focusing on privacy, accessibility, and advanced detection methods.

Bildhuus Aspect is a photo organization software developed by former Nik Software colleagues. They spent four years building it, believing that traditional star ratings and color labels are antiquated and that something better is needed for photo organization.

The main features and characteristics of Aspect include:

• Novel Collection based Organization Approach: Aspect introduces a new approach to photo organization using "Collections". Collections are described as combining the best aspects of albums, tags, color labels, star ratings, and folder hierarchies into a single, clear, and fast concept. Unlike ratings or color labels, collections have names, making their meaning always clear. Aspect supports organizing photos into events/shootings/projects or a loose flow ordered by date, or both simultaneously.

• Peer-to-peer Synchronization across Devices: Aspect includes built-in peer-to-peer synchronization technology. This allows your photo library to be accessible on all your devices without relying on cloud storage, which is seen as beneficial for high-resolution imagery like large RAW files and videos.

• Transparent and Automated Photo Storage: Aspect's organization of your photos is mirrored to the file system on your computer. Changes made within the file system are recognized and incorporated by Aspect, and vice-versa. This transparency means your work is not trapped in an opaque database.

• Standard Metadata and Open Formats.

• No Subscriptions, No Cloud: Aspect has a business model based on a one-time purchase (early-access to Aspect Pro is available for a percentage off) or download (version 1.0.0-rc.19 is available). They believe photo archives should be independent of storage subscriptions and monthly payments, and users should retain full rights and privacy regarding their photos, without cloud companies using or analyzing them for profit.

In essence, Aspect redefines photo organization by moving beyond traditional methods, offering a transparent, non-cloud, and synchronized solution focused on a new "Collections" concept.

protonURL is a service designed for the secure and confidential sharing of information (secret, private, or non-private) via a link.

The main features and characteristics of protonURL include:

• Secure and confidential sharing.

• End-to-end encryption (optional, by default your content is encrypted with a protonURL secret key). The content is encrypted with the AES-256-CBC algorithm. A different key and Initialization Vector (IV) are used for each content. The IV is stored separately from the encrypted data.

• Single use: The content of the protonURL link is deleted upon the first reading or access. This feature is an important security measure to protect the confidentiality of the data and ensure it can only be viewed once, reducing the risk of leaks or misuse.

• Automatic deletion:

  • The protonURL and its content are automatically and permanently deleted from their servers as soon as they are accessed.

  • There is a default automatic deletion policy for unaccessed links: they are deleted after 72 hours.

  • It is possible to modify the lifespan of the link in the advanced options. If the link is not accessed during the selected duration or within the default 72 hours, it will be permanently deleted.

• No permanent storage: protonURL does not store shared data on its servers after it has been accessed. The data is temporarily stored on their servers only for the duration of the sharing link.

• No tracking: protonURL does not store a copy of the shared data on its servers and does not track the activity of viewing sharing links. They do not keep any record of the shared content or of the people who have viewed the sharing links.

• Secret key (optional): The user can activate an option to encrypt the content with a private key they define. This key is not saved by protonURL. It is crucial that the user saves this key and sends it to the recipient so that they can decrypt and display the content. Without this key, it will be impossible to retrieve the content. If a wrong key is used, the system will try to decrypt, the content will be displayed still encrypted, and then it will be deleted like a classic protonURL as soon as it is displayed.

• Advanced options: Allow choosing the expiration duration of the link.

• Secure servers in Europe: Encrypted data is stored on secure servers in Europe and is constantly monitored to ensure its security and confidentiality.

• Proof of deletion: The service offers a "proof of deletion" that allows verifying the cryptographic trace of the deletion of data associated with a URL, either after access or upon expiration. By entering the URL, you can check this proof to ensure the confidentiality and integrity of the shared data.

• Pre-filled links: It is possible to create protonURL links with the text field pre-filled using the prefilled parameter in the URL, whose content must be base64 encoded. This feature is intended for experienced users, and the base64 encoded pre-filled content is not encrypted. It should be used with care and only displayed to people who are already aware of the content or to whom this content is voluntarily sent, not to the public.

• The service is particularly useful for avoiding sending passwords or sensitive content via email or SMS, as with protonURL, all that will remain in these inboxes is a link to content that no longer exists.

In summary, protonURL focuses on confidentiality, security, and the self-destruction of shared information after a single viewing and/or a limited period, using encryption and automatic deletion to ensure that data does not persist.

Tubo is a libre streaming front-end for the web. Its goal is to bring the NewPipe experience to the web by providing a clean and simple user interface to consume media from various streaming platforms. It currently supports the same services as NewPipe, including YouTube, SoundCloud, Bandcamp, and more.

The main features listed for Tubo include:

• No ads.

• Background player.

• Playback queue.

• User playlists.

• System/Light/Dark themes.

Furthermore, Tubo supports several browser extensions like Redirector, LibRedirect, Predirect, and Privacy Redirector. These extensions can redirect links from supported services to Tubo, allowing content to be viewed through the application. For example, Redirector allows you to create redirect rules based on regex patterns for services like YouTube, SoundCloud, Bandcamp, PeerTube, and media.ccc.de to Tubo. LibRedirect and Privacy Redirector support Tubo by default for YouTube and SoundCloud, while Predirect supports it for SoundCloud.

Rybbit Analytics is described as an open source Google Analytics replacement. It is positioned as a next-gen, open source, lightweight, cookieless web & product analytics solution designed to be privacy-friendly or privacy-first.

Features:

• Real-time Analytics: Allows you to see your site performance as it happens with instant data updates and live visitor activity. This includes a specific Live Visitors view.

• Advanced Filters: Provides the ability to drill down into your data using advanced filters across numerous dimensions such as Path, Page Title, Event Name, Referrer, Channel, Entry Page, Exit Page, Country, Region, City, Device Type, Operating System, Browser, Language, Screen Dimensions, UTM Source, and UTM Medium.

• User Profiles: Lets you know who your users are and exactly what they do. Profiles include information like first and last seen dates, number of sessions and pageviews, and an activity timeline.

• User Sessions: Allows you to track complete user journeys through your site with detailed session timelines showing visited pages and triggered events within a session.

• User Flow Analysis: Helps you visualize how users navigate through your site using intuitive path analysis tools.

• Funnels: Allows you to visualize and analyze the path users take through your site to convert them. You can see conversion rates between steps.

• User Behavior Trends: Helps you discover when your users are most active with hourly and daily heatmaps.

• Event Tracking: Allows you to monitor user interactions with your site, including clicks, form submissions, and custom events.

• Goal Conversion: Enables you to set up and track conversion goals to measure the success of key objectives such as Newsletter Signup, Free Trial Registration, Product Purchase, or Support Contact.

The tool also emphasizes:

• Being Open Source.

• Being privacy-friendly ("cookieless", "GDPR/CCPA compliant").

• Being intuitive and easy to set up and use based on user testimonials.

• Offering Seamless Integration with various platforms.

• Providing the possibility for Self-hosting.

TinyFeed is primarily a CLI tool designed to generate a static HTML page from a collection of feeds. It's described as "dead simple" with no database and no config file, relying on a command-line interface.

Features:

• Feed Support: It supports RSS, Atom, and JSON feeds by utilizing the gofeed library.

• Output: Generates a single static HTML page from the input feeds.

• Customization: Highly customizable, allowing the use of external stylesheets and templates.

• Theming: Supports Dark / Light themes based on the system preference.

• Generated Page Properties: The resulting page is lightweight and fully accessible. Visited links appear in yellow and unvisited links in blue.

• Operational Modes: It can be set up to re-generate the output periodically and supports a daemon mode for this purpose.

• Workflow Integration: Easily integrated with tools like crond, systemd, or openrc for automated updates. Other suggested workflows include Docker and Github Action and Page.

• Simplicity: Emphasizes its simplicity with just a CLI and HTML, needing a list of feed URLs as input.

The project was inspired by the simplicity of tinystatus and message boards like Lobste.rs and Hacker News.

VERT.sh is described as a file converter. It supports the processing of images, audio, and documents directly on your device. Videos are converted on lightning-fast servers by default, although there is an option for a local setup. The tool has no file size limit and contains no ads. It is also completely open source.

The sources list the supported formats for each category, indicating that Images, Audio, and Documents are currently "not ready", while Video is "ready".

Glance is a self-hosted dashboard application that aims to consolidate all your feeds into a single place.

Features:

• Various widgets to display different types of information, such as:

  • RSS feeds

  • Subreddit posts

  • Hacker News posts

  • Weather forecasts

  • YouTube channel uploads

  • Twitch channels

  • Market prices

  • Docker containers status

  • Server stats

  • Custom widgets

• It is designed to be fast and lightweight, with low memory usage and few dependencies. It utilizes minimal vanilla JS and offers a small binary for various operating systems and architectures, as well as a small Docker container. Uncached pages typically load within approximately 1 second.

• Glance offers tons of customizability, allowing users to configure:

  • Different layouts

  • As many pages/tabs as needed

  • Numerous configuration options for each widget

  • Multiple styles for some widgets

  • Custom CSS

• It is optimized for mobile devices.

• Glance is themeable, allowing users to easily create their own themes or choose from existing ones.

• Configuration is done through YAML files, allowing for detailed control over the layout and widgets.

• Users can create custom widgets using:

  • iframe widgets to embed content from other websites

  • html widgets to insert static HTML

  • extension widgets to fetch HTML from a URL

  • custom-api widgets to fetch JSON from a URL and render it with custom HTML

• The title of any widget can be changed through its configuration.

• Glance can be installed using Docker compose, manual binary installation for Linux, Windows, and macOS, or through 3rd party channels like Proxmox VE Helper Script, NixOS package, and Coolify.io.

It's important to note that the information on the pages does not update automatically and requires a page refresh, although some elements like the clock and relative time do update dynamically. Widget data is fetched upon page load and then cached, with configurable cache lifetimes.

Apache Airflow® is a platform created by the community to programmatically author, schedule, and monitor workflows.

It is based on several key principles:

* Scalable: Apache Airflow® has a modular architecture and uses a message queue to orchestrate an arbitrary number of workers. Airflow™ is ready to scale to infinity.

* Dynamic: Apache Airflow® pipelines are defined in Python, allowing for dynamic pipeline generation. This allows for writing code that instantiates pipelines dynamically.

* Extensible: It is easy to define your own operators and extend libraries to fit the level of abstraction that suits your environment.

* Elegant: Apache Airflow® pipelines are lean and explicit. Parametrization is built into its core using the powerful Jinja templating engine.

Regarding its main features:

* Pure Python: You can use standard Python features to create your workflows, including date time formats for scheduling and loops to dynamically generate tasks. This allows you to maintain full flexibility when building your workflows. There is no need for command-line or XML black-magic.

* Useful UI: Apache Airflow® provides a robust and modern web application to monitor, schedule, and manage your workflows. You always have full insight into the status and logs of completed and ongoing tasks. There is no need to learn old, cron-like interfaces.

* Robust Integrations: The platform provides many plug-and-play operators that are ready to execute your tasks on various major cloud platforms like Google Cloud Platform, Amazon Web Services, Microsoft Azure, and many other third-party services. This makes Airflow easy to apply to current infrastructure and extend to next-gen technologies. Examples of integrations include Airbyte, Alibaba Cloud OSS, Amazon Athena, Amazon CloudFormation, Amazon CloudWatch Logs, Amazon DataSync, Amazon DynamoDB, Amazon EC2, and more.

* Easy to Use: Anyone with Python knowledge can deploy a workflow with Apache Airflow®. The scope of your pipelines is not limited; you can use it to build ML models, transfer data, manage your infrastructure, and more.

* Open Source: As an open source project, wherever you want to share your improvement, you can do this by opening a Pull Request. It’s simple as that, with no barriers or prolonged procedures. Airflow has many active users who willingly share their experiences. A Slack is available if you have questions.

Gumroad is a platform designed to help anyone earn their first dollar online. The idea is to start simply with what you know, see what works, and get paid. It makes it easier to chart a new path, whether it's for more balance, flexibility, or a different type of work. You don't have to be a tech expert or even understand how to start a business.

Features:

• Sell Anything: The platform allows you to experiment with all sorts of ideas and formats. You can sell video lessons, monthly subscriptions, Top 10 lists, crypto tips, fractal packs, keto cookbooks, C4D scenes, new emojis, Procreate brushes, business insights, content tutorials, and a wide range of digital products from 3D to writing and publishing. Seriously, you can sell anything!.

• Explore Different Payment Options: You can let your customers pay what they want. You can also offer one-time, recurring, or fixed-length payments in your currency of choice. Gumroad handles the administrative details like VAT.

• Build a Loyal Following: Use simple posts, email newsletters, and automated workflows to build and maintain a relationship with your customers.

• Sell Anywhere: Create and customize your own online storefront with their all-in-one platform. You can also choose to use your personal site instead.

• Easy Integration: Seamlessly connect your Gumroad account to thousands of apps using Zapier.

• "Start Small" Approach: The platform encourages placing small bets ("place small bets") rather than scary risks ("Don't take risks"). It's about starting small, getting better together, and learning quickly.

• Revenue Potential: Gumroad can help you generate income, potentially significant, with some users earning more than a six-figure salary or making $10k+ per month selling products they love. Gumroad digital entrepreneurs earned over $3 million in income last week.

In summary, Gumroad enables you to share your work because someone out there needs it, by providing the tools to sell a wide variety of digital products, manage payments, and build your audience, all with an approach focused on experimentation and ease of use.

Typemill is presented as an open-source flat-file CMS designed for websites and eBooks. It is used by individuals and companies to create various types of online content, including user manuals, documentation, knowledge bases, wikis, and handbooks.

Features of Typemill:

• Markdown Editor: Typemill offers both a visual Markdown editor and a raw Markdown editor for easy content creation (free).

• Navigation: Users can organize their website hierarchically using an interactive navigation system with simple drag-and-drop functionality (free).

• AI Assistant: Typemill integrates an AI writing assistant through the Kixote interface, allowing users to connect their accounts for ChatGPT, Claude, or Mistral (free).

• eBooks: The platform enables the creation of highly customizable eBooks in PDF and ePUB formats using a dedicated ebook plugin (free).

• Permissions: Typemill allows for the use of predefined user roles and the ability to restrict access to pages in the frontend (free).

• Search: A powerful and modern full-text search function can be added with the bettersearch-plugin (MAKER-license).

• Templates: Users can create their own content templates or utilize predefined templates with a single click (BUSINESS-license).

• Revisions: The revisions plugin (BUSINESS-license) allows for tracking changes and restoring older versions of content.

• HTML: Secure HTML tags can be used with the html-plugin (MAKER-license).

• SEO Features: Typemill includes SEO functionalities, such as the ability to fetch data from Google Search Console with the seo-plugin (MAKER-license), and is designed for top page speed.

• Mermaid: The free mermaid plugin enables the creation of various types of charts and diagrams.

• Solution Bundles: Typemill offers curated bundles of free and premium plugins and themes tailored for different use cases like user manuals, documentation, knowledge bases, company handbooks, reporting, and informational websites. These bundles can be downloaded and tried locally for free.

• Themes: Users can download existing themes or code their own using HTML and Twig. The platform also features specific themes like the KnowledgeBase Theme and Documentation Theme.

• Plugins: Typemill allows users to download useful plugins or develop their own using PHP and Vue.js.

• Book Layouts: Beautiful book layouts are available for download to help users start publishing projects.

• Headless Mode: Typemill supports headless mode, allowing it to be used as a backend for other applications.

• Regular Updates: A new version of Typemill is released every 4 weeks. The latest version mentioned is 2.16.0, which includes an improved media library.

• Used by various organizations: Typemill is used by organizations such as Wendeware AG, MPI-MP (Max Planck Institute of Molecular Plant Physiology), and LÄMMERZAHL. These organizations appreciate its flexibility, ability to produce professional documentation, and straightforward tools for editing and publishing without extensive training.

In summary, Typemill aims to be an intuitive and flexible CMS, particularly well-suited for creating documentation and knowledge-based content, offering a range of features from Markdown editing and AI assistance to SEO optimization and eBook creation, with both free and licensed plugins and themes to extend its functionality.

Features :

It primarily focuses on the automated analysis and presentation of multi-dimensional data.

VTable is developed based on Canvas.

It is designed to solve rendering and interactive performance issues when handling large amounts of data, enabling smooth navigation even with millions of data points.

Its main function is to provide data computing and visualization capabilities for multi-dimensional data presentation scenarios, such as perspective analysis and tree display.

The sources mention several usage scenarios supported by VTable, including table themes (like BIGTHT), chart types, sales heatmaps, cell custom layout, perspective tables, and QS Major Rankings.

Libredesk is a free and open-source, self-hosted customer support desk that offers full control and comes as a single binary. Here's a summary of its main features according to the sources:

• Multi Inbox: Libredesk supports managing conversations across multiple teams effortlessly through multiple inboxes.

• Granular Permissions: It provides role-based access control allowing for the creation of custom roles with granular permissions for both teams and individual agents.

• Smart Automation: Users can eliminate repetitive tasks by setting up powerful automation rules to auto-tag, assign, and route conversations based on custom conditions.

• CSAT & Analytics: The platform allows for measuring customer satisfaction with automated surveys and tracking key metrics such as response times, resolution rates, and team performance.

• Business Intelligence: Libredesk enables users to connect their favorite BI tools like Metabase to create custom dashboards and reports using their support data without vendor lock-in.

• Canned Responses: Agents can save frequently sent messages as templates for quick responses, including the ability to set tags and more with a single click.

• Smart Organization: Conversations can be kept organized using tags, custom statuses, and snoozing, and any conversation can be found instantly through the search bar.

• Auto Assignment: The system can distribute workload using auto-assignment rules based on agent capacity or custom criteria.

• SLA Management: Users can set and track response time targets and receive notifications when conversations are at risk of breaching SLA commitments.

Libredesk is presented as a 100% open-source solution with all features included. You can also view a live demo and the source code on GitHub.

This tool is a small vanilla JavaScript library that allows making any HTML table sortable by adding the class sortable to the <table> element. Here are the main features:

• Sort by clicking the header: The user can click on a table header (<th>) to change the sorting order of the rows.

• Easy installation: There are several ways to integrate the library:

  • Linking the CSS and JavaScript files via jsDelivr CDN.

  • Copying the files from the dist directory to a local assets folder and linking them.

  • Installing via npm (npm install sortable-tablesort) and then linking the HTML files or importing them into a JavaScript file.

• Non-sortable field management: It is possible to disable sorting for specific columns by using:

  • The class no-sort in the <th> element.

  • CSS rules.

  • Using the <td> element instead of <th> (although this is discouraged for accessibility and styling reasons).

• Sorting indicators (arrows): Arrows indicating the sorting direction can be added via CSS. It is also possible to place them to the left of the text. The library provides example CSS stylesheets for this.

• Sticky headers management: By using the provided CSS file (sortable.min.css) and adding the class sticky to the table, the headers can remain visible during scrolling.

• Specific data sorting: The data-sort attribute in the cells (<td>) allows defining a different value from the displayed one for sorting. This is useful in case of file sizes (KB, MB, GB) or non-standard date formats.

• Alternative sorting: By clicking on a header while holding the shift or alt key, the data-sort-alt attribute is used for sorting instead of data-sort.

• Sorting on a different column (for colspans): The data-sort-col attribute in the <th> element allows specifying a different column to perform the sort on, which is useful in the presence of merged cells (colspan).

• Default sorting order management: Adding the class asc to the <table> element allows defining the default sorting order as ascending.

• Secondary sorting (tiebreaker): The data-sort-tbr attribute in the <th> element allows defining a secondary sorting column to be used when the values of the primary column are identical.

• Null/empty values management: Adding the class n-last to the table (<table class="sortable n-last">) ensures that rows with null or empty values are always sorted last. Note that a string of blank spaces is not considered null/empty.

• Accessibility (A11y): Including the sortable.a11y.min.js file adds basic accessibility features, such as aria-label to the headers and the ability to navigate through the headers with the tab key (tabindex="0"). A global function enhanceSortableAccessibility is provided to activate these features.

• Sort events: The library dispatches two custom events that bubble up the DOM tree: sort-start (when sorting begins) and sort-end (when sorting is complete). It is possible to listen for these events on any parent of the table, including the document.

• Sort on page load: It is possible to trigger a sort on page load by using JavaScript to simulate a click on the desired header.

The library is presented as being small (1.52KB minified, 795 bytes gzipped) and fast, although very large tables may be slow, especially on mobile. It requires the table to have <thead> and <tbody> elements. The management of rowspan is not supported. It is advertised as being compatible with most modern browsers (ie9+ although ie9 compatibility is no longer guaranteed) and works with tables generated by JavaScript thanks to an eventListener. It is also mentioned as working with Svelte, but has not been tested with React, Angular, or Vue.

Keila is an open-source newsletter tool designed for easy and reliable email newsletter creation and management.

Features:

• Email Creation Flexibility: Keila provides multiple ways to create emails, including an easy-to-use visual Block Editor, the ability to write newsletters with Markdown, support for building emails with MJML for full design flexibility, and the option to send plain text emails.

• Template Reliability: It uses rock-solid base templates to ensure newsletters look great across various devices and email clients like Gmail, Outlook, and Thunderbird.

• Contact List Management: Keila allows users to manage and grow their contact lists. It also offers a Form Builder to create customizable sign-up forms with additional fields like checkboxes, text fields, and dropdowns.

• Bot Protection: To maintain the quality of contact lists, Keila enables users to protect forms with a captcha check and verify new sign-ups with double-opt-in.

• Personalization: You can personalize emails using custom data fields from sign-up forms or external sources (like CMS or CRM systems) with Liquid templates. Each contact and campaign's custom data is represented as a JSON object.

• Segmentation: Keila allows for targeting emails with segments by creating subsets of mailing lists based on contact data like language preferences or tags, offering both a visual editor and a powerful segment language.

• Analytics and Privacy: Keila provides email analytics to gain insights into campaigns while respecting user privacy. Users also have the option to turn off tracking entirely for more privacy-conscious campaigns.

• Extensibility: Keila offers a comprehensive API for managing contacts and campaigns, enabling integrations with existing tools and automation of email marketing workflows. A Zapier integration is currently in private beta for a no-code/low-code option.

• Open Source and No Vendor Lock-in: Keila is 100% Open Source with no proprietary premium features, giving users full control of their data. It is licensed under AGPL.

• Self-Hosting and Managed Options: Users can self-host Keila using the official Docker image or use the managed Keila Cloud service hosted in the EU (Germany and France), ensuring strict European privacy standards. There's also a fully managed "Send with Keila" option.

• Bring Your Own Email: Keila supports using your own email service provider via SMTP, AWS SES, Mailgun, Postmark, and Sendgrid.

• Support: Keila emphasizes providing awesome support to help users with various aspects of sending newsletters.

• Form Protection: It offers form protection with hCaptcha and Friendly Captcha.

• Import and Export: Keila supports CSV import & export of data.

• Recent Updates: Recent updates include improved previews for desktop and mobile, external IDs for contacts to synchronize with external systems, and availability in French. It also added MJML support, filtering and sorting of contacts, and custom signup fields in the past.

Keila aims to be a true open-source alternative to proprietary email marketing tools.