Open Source & Free Tools for Web Workers

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.

Alacritty is presented as a modern, cross-platform terminal emulator. Here's a summary of its main functionalities:

• Cross-Platform Support: Alacritty is compatible with BSD, Linux, macOS, and Windows operating systems.

• Performance-Oriented: By integrating with other applications, Alacritty aims to provide a flexible set of features with high performance.

• Sensible Defaults with Extensive Configuration: It comes with sensible default settings but allows for extensive customization.

• Beta Software: Alacritty is currently in beta development, meaning it might have some missing features and bugs, but it is already used by many as their primary terminal.

• Vi Mode: It offers a Vi Mode that allows users to move around and create selections using vi keybindings.

• Search Functionality: Users can search for any text within the scrollback buffer.

• Regex Hints: Alacritty supports Regex Hints to mark any text for interaction with the mouse or keyboard.

• Multi-Window Support: It provides Multi-Window functionality, which improves resource usage by utilizing only a single Alacritty process.

• Comprehensive Documentation: A full list of features can be found in Alacritty's documentation.

Waveform Renderer is a lightweight and customizable TypeScript library for rendering audio waveforms on HTML canvas. Its primary function is to create visual representations of audio files.

Features:

• Highly customizable appearance.

• Performant canvas-based rendering. This indicates that the library uses the HTML canvas element for efficient drawing of the waveforms.

• Responsive and touch-friendly, making it suitable for various devices.

• Real-time progress updates, allowing users to see the current playback position.

• Interactive seeking, enabling users to navigate through the audio by interacting with the waveform.

• Written in TypeScript with full type support, which enhances code maintainability and provides better developer experience.

• Resolution independent with HiDPI/Retina support, ensuring crisp visuals on high-resolution screens.

• It offers various configuration options to control the waveform's appearance, such as color, background color, bar width, gap, and progress line styling.

• It provides support for events such as renderStart, renderComplete, seek, error, destroy, ready, resize, and progressChange, allowing developers to respond to different states and interactions.

• The library exports a main WaveformRenderer component and a utility function getPeaksFromAudioBuffer for calculating waveform data from raw audio.

• It includes methods to setOptions, setPeaks, setProgress, and destroy the waveform instance.

• Waveform Renderer is designed to be a focused alternative to larger audio libraries like wavesurfer.js, concentrating solely on waveform visualization and thus having a smaller bundle size and optimized performance for waveform rendering. It does not include features like playback, regions, or spectrograms.

• It supports modern browsers that support Canvas and ES6.

Cogno Terminal is presented as a free and open-source terminal emulator with a strong emphasis on user control, privacy, and intelligent assistance. Here's a summary of its main functionalities:

• Open Source and Free: Cogno is completely open source, allowing users the freedom to customize it. It is also absolutely free.

• Privacy and Control: Cogno does not require a login and does not collect analytics by default, giving users control over their terminal and ensuring privacy.

• Intelligent Assistance: Cogno learns from your input and provides useful suggestions, requiring only a few keystrokes to find what you need.

• Powerful Autocompleter: The autocompleter learns from your inputs across different command-line tools and suggests the right commands at the right time.

• Tabs and Nested Panes: Cogno supports tabs and multiple nested panes, allowing users to maintain an overview even with several open shell sessions.

• Configurable Shortcuts: Users can configure shortcuts seamlessly across different shells (Bash, Powershell, Zsh), ensuring consistency.

• Blazing Fast Navigation: Cogno learns frequently visited folders and suggests them for quick directory switching.

• Workspaces: Users can save their window layout and open tabs in workspaces for quick restoration of preferred arrangements.

• Shell Command and Output Recognition: Cogno allows users to copy shell commands or their output with a single click and to instantly scroll to the beginning of the output, eliminating endless scrolling.

• Cross-Platform and Shell Compatibility: Cogno ensures consistency between different operating systems and shells, reducing the need for users to adapt or mentally rearrange.

• Effortless Customization: Cogno offers effortless theming to personalize the terminal's appearance.

• Theme Editor: A theme editor with a preview function is included, making theme customization easy.

• JSON File Configuration: Users can also customize settings by editing an openly stored JSON file using a text editor.

• Wide Range of Themes: Cogno offers a wide selection of 150+ installable themes powered by terminal.sexy.

• Availability: Cogno is available in Stable and Nightly builds for Windows (10, 11), MacOS (Apple Silicon and Intel), and Linux (Ubuntu, Debian .deb and Red Hat, Fedora, SUSE .rpm).

In essence, Cogno Terminal aims to provide a highly customizable, intelligent, and user-friendly terminal experience while prioritizing user privacy and control across various operating systems and shells.

Rio Terminal is a modern terminal for the 21st century.

Here's a summary of its main functionalities:

• Performance: Rio boasts fast performance, leveraging technologies like Rust and advanced rendering architectures. It is described as delivering "S+ performance".

• True Color Support: Unlike regular terminals limited to 256 colors, Rio supports 24-bit true color, allowing it to display up to 16 million colors.

• Images in Terminal: Rio can display images within the terminal using Sixel and iTerm2 image protocol.

• Cross-Platform Compatibility: Rio is a cross-platform application that runs on Windows, macOS, Linux, and FreeBSD.

• Font Ligatures: It supports font ligatures, which can improve the readability of common expressions or operators.

• Splits: Rio provides support to split and manage terminal screens on any platform.

• RetroArch Shaders: Users can configure custom filters and CRT shaders through RetroArch shader files.

• Positive User Feedback: Many engineers and users have expressed their satisfaction with Rio, highlighting its speed, ease of configuration, aesthetics, and features. It has been described as "super fast," "easy to configure," having "great aesthetics out of the box," "smooth and fast," and a "go-to solution". One user mentioned it fulfills all their needs while working heavily with git/docker/spring/npm. Another user who beta-tested it mentioned learning a lot about developing a terminal emulator through the experience.

In essence, Rio Terminal focuses on being a fast and feature-rich terminal emulator with modern capabilities like true color support and image display, while also being cross-platform and customizable with features like splits and shaders. It has garnered positive feedback for its performance and user experience.

Based on the provided sources, Pandoc is a universal document converter, acting as a "swiss-army knife" for converting files between various markup formats.

Features:

• Format Conversion: Pandoc can convert between a wide array of formats, including:

  • Lightweight markup formats like Markdown, reStructuredText, AsciiDoc, Emacs Org-Mode, and others.

  • HTML formats such as (X)HTML 4 and HTML5.

  • Ebook formats including EPUB and FictionBook2.

  • Documentation formats like GNU TexInfo and Haddock markup.

  • TeX formats such as LaTeX and ConTeXt.

  • XML formats like DocBook and JATS.

  • Outline formats like OPML.

  • Bibliography formats including BibTeX, BibLaTeX, and CSL JSON.

  • Word processor formats such as Microsoft Word docx, RTF, and ODT.

  • Interactive notebook formats like Jupyter notebook (ipynb).

  • Page layout formats such as InDesign ICML and Typst.

  • Wiki markup formats like MediaWiki, DokuWiki, and others.

  • Slide show formats like LaTeX Beamer, Microsoft PowerPoint, and reveal.js.

  • Data formats like CSV and TSV tables (as input).

  • Terminal output in ANSI-formatted text.

  • Custom formats through user-written Lua readers and writers.

  • PDF generation via various TeX engines and other tools.

• Markdown Extensions: Pandoc understands and can utilize several useful Markdown syntax extensions, including:

  • Document metadata (title, author, date)

  • Footnotes

  • Tables

  • Definition lists

  • Superscript and subscript

  • Strikeout

  • Enhanced ordered lists

  • Running example lists

  • Delimited code blocks with syntax highlighting

  • Smart quotes, dashes, and ellipses

  • Markdown inside HTML blocks

  • Inline LaTeX

  • These extensions can be turned off for strict Markdown compatibility.

• LaTeX Math Support: Pandoc can handle LaTeX math (and even macros) within Markdown documents. It offers different methods for rendering math in HTML, such as MathJax and MathML conversion, and can convert LaTeX math to Unicode, native Word equation objects, MathML, or roff eqn as needed by the output format.

• Automatic Citations and Bibliographies: Pandoc features a powerful system for automatic citations and bibliographies. Users can write citations using a specific syntax (e.g., [@doe99]) and Pandoc will automatically format them according to hundreds of CSL styles and generate a bibliography at the end of the document. It supports bibliographic data in BibTeX, BibLaTeX, CSL JSON, and CSL YAML formats, and citations work across all output formats.

• Customization: Pandoc offers various ways to be customized, including a template system and a powerful system for writing filters.

• Architecture: Pandoc includes a Haskell library and a standalone command-line program. Its library has separate modules for each input and output format, making it easier to add new format support.

• Licensing: Pandoc is free software released under the GPL.

In summary, Pandoc's primary functionality is its ability to seamlessly convert between a vast number of different document formats, making it an incredibly versatile tool for anyone working with text-based files. It also enhances Markdown with useful extensions and provides robust support for LaTeX math and automatic bibliography generation. The tool is designed to be customizable and extensible.

Wavesurfer.js is presented as an open-source audio visualization library in JavaScript designed for creating interactive and customizable audio waveforms. It supports both HTML5 Audio and Web Audio.

Features:

• Core Functionality: It can render responsive and customizable waveforms from audio files. A basic example shows how to display a waveform in a designated HTML container and initiate playback on interaction.

• Extensibility through Plugins: Wavesurfer.js is designed to be highly extensible with plugins. Several official plugins are listed, which add significant functionality:

  • Regions: Enables the creation of clickable overlays on the waveform to mark specific audio segments.

  • Hover: Displays the current time position when the user hovers their mouse over the waveform.

  • Envelope: Provides a graphical interface for controlling fade-in, fade-out, and overall volume of the audio.

  • Record: Allows recording audio directly from the user's microphone and visualizing it as a waveform.

  • Minimap: Displays a smaller overview waveform that can act as a scrollbar for navigating the main waveform.

  • Timeline: Adds visual time markers and labels beneath the waveform for better orientation.

  • Spectrogram: Generates a visual representation of the audio's frequency spectrum using Fast Fourier Transform (FFT).

• Versatile Applications: The examples suggest a wide range of applications for wavesurfer.js:

  • Basic waveform visualization

  • Multi-track audio mixing

  • Adding annotations to audio

  • Real-time audio recording and visualization

  • Implementing a Web Audio equalizer

  • Creating audio players with a SoundCloud-style interface

• Developer-Friendly: It offers a TypeScript API with comprehensive documentation, indicating a focus on providing a well-structured and typed interface for developers. The project also acknowledges its contributors, suggesting an active open-source community.

Happy Hues is a color palette inspiration website that showcases curated colors in context, acting as a real-world example of how these colors can be applied to design projects. Key features of the website include:

* Displaying color palettes and allowing users to toggle between them to see different color schemes.

* Providing the hex codes for each color within a palette, with a click-to-copy functionality.

* Illustrating how colors can be used for various design elements such as background, headline, sub-headline, buttons, illustrations, card backgrounds, card headlines, and more.

* Offering a section dedicated to color terminology, explaining concepts like hue, tint, shade, tone, value, and saturation.

* Providing insights into the psychology of different colors, detailing the feelings, emotions, and associations linked to red, yellow, blue, green, orange, purple, white, and black.

* Introducing Mackenzie Child, the creator of Happy Hues, and explaining her goal to help users understand how to apply color palettes to their designs.

* Briefly mentioning some of Mackenzie Child's other projects, such as Colorables, Acme Logos, and Blocks wireframe.

* Stating that Happy Hues, along with other projects, is designed and built visually using Webflow.

NES.css is presented as a NES (8-bit) style CSS framework. Its main functionality is to provide components. It's important to note that NES.css focuses solely on components, which means you'll need to define your own layout to use them. For installation, NES.css is available via npm, Yarn or a CDN. The framework is developed by a core team (Core Team Members), and also pays tribute to former active members (Core Team Emeriti) while acknowledging its contributors.

ArtFeed is a feed reader designed for photographers and artists, focusing on images. It allows users to stay updated with the latest photos from their favorite photographers and artists, even if they are not active on social networks. The application enables users to follow RSS or Atom feeds from websites or social networks.

Invitations are regularly offered on the Mastodon account https://mamot.fr/@atlza

The "ResponsiveImage" JavaScript library has several key features:

• Responsive Images Made Easy The library simplifies the implementation of responsive images.

• Multi-Framework Support It supports various frontend frameworks like Ember, Solid, Svelte, and offers a universal web component, along with Vite and Webpack for local image processing.

• Next-Gen Image Formats It supports modern image formats such as WebP and AVIF, in addition to standard PNG and JPEG, to optimize image quality and file size.

• Local Image Processing It facilitates fast processing of local images, allowing for optional filters and effects, and generates responsive images at different sizes using the Sharp library.

• Image CDNs The library supports integration with image CDNs like Cloudinary or imgix through an image provider abstraction.

• Image Placeholders It supports Low Quality Image Placeholders (LQIP) using dominant colors, blurred low-resolution images, or ThumbHash placeholders to show previews while loading.

• Layout Modes Offers layout modes for fixed sizes (with 1x and 2x image variants) and responsive layouts using srcset with optimized image sizes across devices.

• Web Performance It includes lazy rendering by default, optimized content visibility and decoding settings, and optimized markup to prevent Cumulative Layout Shift (CLS).

• High Quality The library is thoroughly tested and built with modern tooling, including native TypeScript types.

Code in your browser, save, download, share the result.

Linkding is a self-hosted bookmark manager with the following features:

• Minimal, fast, and easy to set up.

• Optimized for readability, allowing quick addition and finding of bookmarks without distractions.

• Customizable with adjustable UI and features that can be enabled/disabled.

• Automatically fetches metadata such as titles, descriptions, icons, and preview images of bookmarked websites.

• Archiving creates snapshots of bookmarked websites either as local HTML files or on the Internet Archive.

• Bulk editing allows applying operations to a selection of bookmarks or the entire collection.

• Import/export bookmarks in the Netscape HTML format.

• Supports multiple users, with the ability to share bookmarks.

• Browser extensions for Firefox and Chrome allow adding and searching bookmarks from within the browser.

• REST API for developing scripts or 3rd party apps.

• Low maintenance using a single Docker container and SQLite database, with automated migrations and zero breaking changes.