Open Source & Free Tools for Web Workers

happyconf.net is a web-based platform designed to transform inactive conference screens into professional, animated displays and provide organizers with practical event management tools.

The main features of this service include:

• Animated Slideshows: It allows organizers to create elegant presentations to highlight speakers, showcase sponsors, share announcements, and display quotes from the event.

• Integrated Event Utilities: Beyond slides, the platform includes a remote-controlled countdown timer, a large room clock, and a fair prize draw system to entertain and inform attendees during breaks.

• Web-Based and Installation-Free: The service runs entirely in a web browser, requiring no software installation; it can be projected onto any connected screen, TV, or projector.

• Professional Visual Themes: Users can choose from ready-made themes like "Cyberpunk," "Glassy," or "Romantic," or request a fully custom theme to match their specific graphic identity.

• Real-Time Dashboard: Content is managed through a private admin area, and the public display updates in real time as changes are made.

• Event-Based Pricing Model: Instead of a recurring subscription, it offers a "pay-per-event" system with tiers (Starter, Pro, and Custom) tailored to different event sizes, from small meetups to large professional conferences.

• Privacy and Data Sovereignty: To display content, a login is required; once an event is over, all user data is typically deleted to ensure privacy.

Sendy is a self-hosted email newsletter application that sends bulk emails 100x cheaper via Amazon SES.

Here are its main features:

Core Value Proposition:

• One-time payment of $69 (no monthly fees)

• $1 per 10,000 emails via Amazon SES (compared to expensive monthly subscriptions)

• No subscriber limits

• Pay only when you send

Campaign Management:

• Beautiful reports with visualizations of opens, clicks, bounces, complaints, and geographic data

• Export subscriber segments from reports for re-targeting

• Send to lists or segments

• High deliverability rates through Amazon SES

Automation:

• Autoresponders - Setup drip campaigns with automated follow-up emails at custom intervals

• Annual or one-off emails at specific dates

• Rules & Webhooks - Trigger actions based on events (e.g., get notified when campaigns start, trigger webhooks, auto-unsubscribe based on conditions)

List Management:

• Mass import/delete subscribers

• Custom fields for storing additional subscriber information

• Single/double opt-in options

• List segmentation - Create targeted segments based on any conditions

• Subscribe forms and API integration

• Custom subscribe/unsubscribe confirmation pages

Client Management:

• White-labeled client accounts - Create multiple "brands" for different products/services

• Give clients access to their own brand portal

• Set custom pricing and monthly sending limits

• Adjust client privileges

Technical Features:

• Custom domains - Use your own domain for unsubscribe, web version, and trackable links

• Automatic bounce & complaint handling - Real-time automated cleanup

• Housekeeping - Remove unconfirmed or unengaged subscribers with one click

• Works with SendGrid, Mailjet, and Elastic Email (in addition to Amazon SES)

Integrations:

• Third-party plugins for WordPress, Magento, Joomla

• Zapier integration for thousands of apps

• Full API access

Hosting:

• Self-hosted on your own Apache/Linux server with PHP & MySQL

• Optional installation service available (+$79)

• Can be installed on Amazon EC2 for optimal performance

Sendy is particularly popular among users with large subscriber bases who want to escape escalating monthly fees from services like Mailchimp.

1. Invoice-Generator.com (Online Tool & API)

This tool functions as a simple, free online invoice maker that allows users to quickly generate professional-looking invoices, primarily aimed at freelancers and small business owners.

• Ease of Use: It is highly praised for its user-friendliness, speed, and straightforward interface, allowing for quick creation and download.

• Output Formats: Generates invoices as PDFs.

• E-Invoicing Support (API): Offers an API (Invoice Generator API) that can generate e-invoices in UBL (Universal Business Language), a format necessary for digital compliance, with the PDF embedded.

• Customization: Supports adding logos, specifying VAT/Tax details, using custom fields (e.g., purchase order or account number), and adjusting localization (e.g., French, German, Spanish).

• Data Privacy: The service explicitly states that it does not store user invoice data. However, the web tool can remember the user's last invoice details without requiring a login.

• API Usage: The API provides endpoints for both PDF and UBL e-invoice creation, accepting inputs via cURL or JSON. The free API plan has a limit of 100 invoices per month.

2. Comparison of Invoicing Tools (Generator vs. Software)

The sources distinguish between simple generators and full invoicing software:

Tool CategoryKey Functionalities (Pros)Key Limitations (Cons)Invoice GeneratorTypically free. Easy to use; what you see is what you get. Offers short-term speed.Does not save invoices, requiring users to manually store them. No automatic tracking of due dates or overdue payments. No easy way to accept payments (requires third-party gateways). Cannot automatically generate credit notes.Invoice SoftwareCreates professional invoices. Saves client, product, and company details for quick reuse. Safely stores all invoices for auditing and bookkeeping. Automatically tracks and flags overdue invoices. Can automatically generate credit notes.Can be a costly investment, though many free options (like Conta) exist.

3. French E-Invoicing (Facturation Électronique) Framework

This mandatory governmental system is being introduced in France to replace traditional paper and standard PDF B2B invoices, aiming to simplify tax obligations and reduce fraud.

• Mandatory Compliance: Applies to all VAT-registered businesses in France.

• Deadlines: All businesses must be able to receive electronic invoices by September 1, 2026. Emission deadlines vary by company size: large/medium enterprises must issue by September 1, 2026, while small/micro-enterprises must issue by September 1, 2027.

• Required Formats: Invoices must use specific structured digital formats like Factur-X (XML/PDF hybrid), UBL (Universal Business Language), or CII (Cross Industry Invoice).

• Transmission Channel: Mandatory exchange must occur via certified Partner Dematerialization Platforms (PDPs). The Public Invoicing Portal (PPF) serves as a central directory and data hub, not a primary exchange platform.

• E-Reporting: Requires electronic transmission of key transaction data (not the full invoice) to tax authorities for non-B2B transactions, such as B2C sales and cross-border/international transactions (exports/imports).

• Invoice Lifecycle Management: The system requires real-time, mandatory tracking of the invoice lifecycle, including automated status updates (e.g., Submitted, Rejected, Paid).

• Sanctions: Failure to issue or transmit e-invoices or e-reporting data can result in significant penalties (e.g., €15 per non-compliant invoice, up to €15,000 annually per business).

4. Other Software Mentions

• Momenteo: A free online invoicing and quoting software tailored for freelancers (travailleurs autonomes). Its features include creating and personalizing quotes/invoices, tracking their status, managing clients and expenses, and using an intuitive calendar to track work, mileage, and expenses for simplified bookkeeping.

• Wave, Zoho Invoice, Square, Bookipi, Paymo: These are full-featured free invoicing software solutions recommended for various business needs, offering features like recurring billing, detailed reporting, client management (mini-CRM in Zoho), time-tracking integration (Paymo), and seamless connection to payment processors.

Pixelfed is an Instagram-like platform run by communities instead of a big company, with no ads, no tracking, and enhanced privacy focus. It's a free and open-source photo sharing platform built on the decentralized Fediverse network.

Key Features

• Photo & Video Sharing: Upload and share images and videos with support for high-quality formats without compression

• Stories: Temporary content sharing similar to Instagram stories

• Collections & Albums: Organize posts into themed collections and group multiple photos into single posts

• Portfolio Feature: Create curated portfolios of your work with RSS feed support

• Social Interactions: Standard features like likes, comments, reposts, direct messaging, and user tagging

• Content Discovery: Browse through local feeds (your server), global feeds, trending posts, and hashtag-based searches

• Privacy Controls: Set accounts as public or private, create unlisted posts, and use two-factor authentication

• Moderation Tools: Built-in tools for content moderation

Fediverse Integration Pixelfed uses the ActivityPub protocol, enabling cross-platform interaction with other Fediverse platforms like Mastodon and Akkoma. You can follow users and interact with content across different platforms seamlessly.

No Algorithm, No Ads The platform never pushes content to users, helping limit endless doomscrolling while putting you in charge of what you view. There's no data selling to third parties.

Accessibility Official mobile apps for both Android and iOS are available, along with a polished web interface.

Langis, is an unofficial, modified version of the Signal application designed specifically to address limitations and privacy concerns related to Google services.

Here are the primary features and functionalities of Langis:

Core Functionality: Google Play Services Removal

• Opting Out of Google Services: Langis is a patched version of Signal that removes support for Google Play Services (specifically used by vanilla Signal to notify devices when new messages arrive).

• Enabling Use on Restricted Devices: The removal of Google Play Services allows Signal to function on any Android device that lacks or has disabled these services. This resolves "corner cases" where the regular version of Signal is unusable, such as on devices running LineageOS with MicroG.

• Privacy Focus: The project aims to give users the choice to opt out of Google Play Services, addressing potential privacy threats associated with their use.

Technical Features and Software Integrity

• Source Code Transparency: Langis is Free Software. The developers follow specific, documented steps to build the application, including providing the source code and build instructions.

• Patching Process: The process involves downloading the source code of the official Signal-Android app, applying a patch to remove Google Play services, and then building the patched version using Signal-Android's reproducible-builds stack.

• Signed APKs: The resulting APKs are signed, which allows users to upgrade their modified Signal application without needing to uninstall the previous version.

• Artifact Archive: All necessary elements for building, including the patch, build steps, and resulting signed APKs for the latest successful build, are available in a published artifacts archive.

Distribution and Installation

• Fdroid Repository: Langis is available through Fdroid via a custom repository called "patched-apps".

• Direct Download: The latest APK is also available via a direct download link.

Known Development Constraint

• Building Difficulty: The developers currently face difficulties building new versions because the Signal (on which Langis is based) now requires more than 16GB of RAM.

Chartify is a Python library specifically designed to make it easy for data scientists to create charts.

Here is a summary of its main features and functionalities:

Core Library Functionalities (Chartify)

• Chart Creation for Data Scientists: Chartify is a Python library that makes it easy for data scientists to create charts.

• Simple and Intuitive API: The project prioritizes ease of use, having a simple API that is intuitive and easy to learn.

• Consistent Data Input: All plotting functions utilize a consistent tidy input data format, which reduces the time spent transforming data.

• Smart Default Styles: Users can create pretty charts with very little customization required due to the built-in smart default styles.

• Underlying Technology and Flexibility: Chartify is built on top of Bokeh. This provides flexibility, allowing users to fall back on Bokeh's API if they need more control.

• Installation: It can be installed via pip (pip3 install chartify).

• PNG Output Requirement (Optional): For users who require PNG output, an additional dependency, chromedriver, must be installed and configured in their system PATH.

• Support and Licensing: The project adheres to the Apache-2.0 license and offers support via the chartify tag on StackOverflow.

GitHub Platform Features (Context)

As Chartify is hosted on GitHub, it utilizes the platform's developer environment features:

• AI and Code Tools: Features like GitHub Copilot (to write better code with AI), GitHub Spark (to build and deploy intelligent apps), and GitHub Models (to manage and compare prompts) are available.

• Development Workflow: Developers can use Actions (to automate workflows), Codespaces (for instant dev environments), Issues (to plan and track work), and Code Review (to manage code changes).

• Security: GitHub Advanced Security helps users find and fix vulnerabilities.

• Search and Exploration: Users can search code, repositories, users, issues, and pull requests, and utilize saved searches to filter results more quickly.

Laboratory (Content Security Policy / CSP Toolkit) is an Firefox extension that helps you generate a Content Security Policy (CSP) header for your website.

Here is a summary of its principal functionalities:

• Type and Platform: Laboratory is a WebExtension designed for the Firefox browser.

• Core Functionality: Its main purpose is to help users generate a proper Content Security Policy (CSP) header for their website.

• Goal: The extension aims to ensure good website security.

• Usage Flow: To generate the policy, users must simply start recording, browse their site, and then enjoy the CSP header that it produces.

• Permissions: The extension requires specific browser permissions to operate, including accessing browser tabs, accessing browser activity during navigation, and accessing your data for all websites.

• Licensing: The tool operates under the Mozilla Public License 2.0.

CloudConvert is an online file converter and a universal app for file conversions. It is designed to convert and manipulate various file formats online without requiring users to download any software.

Here are the principal functionalities and features of CloudConvert:

1. Comprehensive File Conversion

• Format Support: CloudConvert supports over 200 formats, covering nearly all audio, video, document, ebook, archive, image, spreadsheet, and presentation formats.

• Specific Converters: It offers dedicated tools for Archive, Audio, CAD, Document, Ebook, Font, Image, Presentation, Spreadsheet, Vector, and Video conversion.

• High Quality and Customization: The platform delivers high-quality conversions by utilizing open-source software and partnering with various software vendors. Most conversion types can be adjusted by the user, such as setting the quality and various other options.

2. File Optimization and Manipulation Tools

• Optimization: CloudConvert includes features to Optimize Files, specifically allowing users to Compress PDF, Compress PNG, and Compress JPG. It also supports PDF OCR (Optical Character Recognition).

• Merging: Users can Merge PDF files.

• Archives: It provides functionalities to Create Archive and Extract Archive.

3. Website Capture Services

• Web-to-File: The platform can Capture Websites in various formats, including Save Website as PDF, Website PNG Screenshot, and Website JPG Screenshot.

4. Powerful API and Automation

• API Functionality: CloudConvert offers a Powerful API for custom integrations. The API supports many file conversion types, including Office to PDF, iWork to PDF, and PDF to Office, as well as Video Encoding.

• API Utility Features: The API also allows for Compress PDF, Compress Images, Merge PDF, Thumbnail generation, and Watermark application.

• Integration: The API includes full Amazon S3 integration.

• Pricing Model: API access is paid only for what is actually used, with discounts available for high-volume customers.

• Resources: Documentation is provided, including API Documentation, a Quickstart Guide, and a Job Builder.

5. Security and Business Model

• Data Security: CloudConvert is ISO 27001 certified. It assures users that no one except [them] will ever have access to [their] files.

• Trust and Revenue: The company has been trusted since 2012 and earns money by selling access to its API, not by selling user data.

The Open Wireless Movement is a vision aiming for a future with ubiquitous open Internet access. This movement advocates for a world, particularly in urban environments, where dozens of open networks are readily available.

Core Principles and Goals

The Open Wireless Movement promotes several societal changes and technological advancements:

1. Ubiquitous Access: The goal is for devices like tablets and smartwatches to automatically join available open networks.

2. Sharing Norms: It seeks to establish a societal expectation of sharing wireless capacity, leading to more efficient use of the Internet.

3. Privacy Enhancement: By utilizing shared networks, the movement aims to eliminate the false notion that an IP address serves as a sole identifier, thereby creating a norm that enhances privacy.

4. Advocacy: The movement works with advocates to change how individuals and businesses approach Internet service, encouraging users to open their wireless networks, often via guest networking features to preserve their protected private network.

Key Benefits

Proponents of Open Wireless highlight numerous benefits:

• Innovation: Ubiquitous, cheap connectivity will foster a new era of innovation by making new technologies possible without requiring expensive 3G/4G mobile data plans or permission from phone companies. This could lead to practical devices like phones that only use Skype, smartwatches that always show Internet-derived information, or quadcopters navigating by WiFi.

• Economic Development: Open wireless is beneficial for small businesses (like cafés and bookstores) as it attracts customers and serves as an important community service. Municipalities also benefit, as reliable connectivity can enhance tourism and development.

• User Privacy: The reliance on shared open networks could replace current systems where smartphones act as "spy phones" that continuously broadcast location and communications to single carriers for advertising or other purposes.

• Emergency Services: Open networks have been shown to aid rescue workers during crises, such as the Minneapolis I-35 bridge collapse and an earthquake in Italy.

• Resource Conservation: Open wireless conserves scarce radio spectrum because wireless devices send signals over shorter distances and at lower power compared to cellular towers, thereby avoiding congestion on cellular networks.

• Bridging the Digital Divide: Open networks extend the benefits of the Internet to populations lacking access to broadband.

Implementation and Legal Considerations

• Participation: Users are encouraged to open their networks (often utilizing a router's guest feature) and spread the word, potentially by naming their open network "openwireless.org".

• Security: Advocates emphasize that opening a network is generally safe, especially if a separate guest network or wireless isolation is used. Strong security technologies like HTTPS Everywhere or VPNs are recommended. The security loss from moving to an open network is considered less significant than sometimes perceived, especially since transport layer encryption (like TLS/HTTPS) is the gold standard for security.

• Liability: While complex, the belief is that significant legal protections already applying to Internet Service Providers (ISPs) also apply to open wireless operators in the United States, greatly reducing the risk of liability for the illegal actions (like copyright infringement) of neighbors or passersby. To obtain additional protection, operators can adopt and implement the Open Wireless Movement's repeat infringer policy, often by using the SSID "openwireless.org".

Status Update

It is important to note that the Electronic Frontier Foundation (EFF) is not currently working on promoting the Open Wireless Movement, as of 2024.

Tooty, is an alternative multi-accounts Web client for Mastodon.

Features:

Core Functionality

• Mastodon Client: Tooty serves as a dedicated web client for the Mastodon social network.

• Multi-Account Support: A key feature is its ability to manage multiple accounts simultaneously.

• Written in Elm: The application is an experimental client written predominantly in the Elm programming language (92.3%). It also uses CSS (6.1%) and HTML (1.6%).

Technical Usage and Deployment

• Fully Static Web Application: Tooty is a fully static web application designed to run in recent browsers.

• No Custom Server Required: Users do not need any custom server setup to utilize it. It only needs to be served (e.g., over HTTP).

• Publicly Hosted Option: A public version of the client is hosted on Github Pages.

• Self-Hosting: Users can self-host the application by obtaining a build and serving it over HTTP.

• Licensing: The project is available under the MIT Licence.

Development and Optimization Features (for self-hosters/developers)

The repository provides commands for development and production deployment:

• Building: The application can be built using $ npm run build.

• Optimization: The optimization command ($ npm run optimize) compresses and optimizes the generated JavaScript bundle, typically reducing its size by about 75%. This step is intended for deploying Tooty to production.

• Deployment: A command exists to deploy the app specifically to GitHub Pages ($ npm run deploy).

• Testing: Developers can launch the test suite using $ npm test.

• Development Servers: Commands are available to start the development server ($ npm run live), or run it in live debug mode (e.g., $ npm run debug:all to watch for CSS changes).

1. Core Mission and Privacy Philosophy

The primary focus of the e Foundation is data privacy.

• Data Sovereignty: The foundational belief is that "Your data is YOUR data!".

• Privacy by Design: The system is built to provide privacy by design, aiming to help users "escape from Mobile Surveillance".

• Non-Tracking Guarantee: The foundation is committed to not scanning data (on the phone or in the cloud), not logging or tracking GPS location, and not collecting what users are doing with their apps. They state they "never will".

• Non-Profit and Open Source: The e Foundation is a non-profit organization leading the development of Open Source mobile operating systems that respect users’ data privacy.

2. /e/OS Operating System

/e/OS is a mobile operating system based on fully deGoogled Android.

• Design and Experience: The OS is described as having a new, optimized appearance in its User Interface and is considered a "very pleasant to use OS". The development is supported by a great support team working hard on the beta with very regular updates.

• Compatibility: Despite being "deGoogled," the OS is compatible with all apps, allowing users to run most of their favorite applications, access bank accounts, chat, and play games.

3. Advanced Privacy and Security Features

/e/OS includes built-in features to protect the user from tracking and surveillance.

• App Tracker Evaluation: Each app in the /e/OS app store is scanned and analyzed. Users are informed about trackers found in apps, allowing them to see which apps are safe and which should be avoided regarding personal data.

• Advanced Privacy Widget: This widget provides users with control over their digital footprint.

  • It allows users to choose whether or not to stay tracked.

  • It offers features for hiding the IP address or geolocation when desired.

• Ad Blocking: An ad blocker is enabled by default in the web browser. This feature, combined with the tracker control, helps users enjoy a digital life with very few or no ads in applications and on the web.

4. Ecosystem and Services (Murena)

The e Foundation offers supporting products and services:

• Murena Smartphones: Users can purchase a Murena smartphone with /e/OS pre-installed.

• Murena Workspace Account: Users can sign up for a FREE Murena workspace account.

  • The account includes a unique and personal @murena.io ID.

  • It comes with 1 GByte of cloud storage and other benefits.

• Community and Resources: The project is supported by a vibrant growing international community of entrepreneurs and developers. Resources include Documentation and Source Code available for developers and users.

Core Functionality and Design

• Computation over Storage: LessPass operates by computing passwords rather than generating and storing random ones in a file.

• Unique Password Generation: It generates unique passwords for websites or accounts based on a master password and information you know (such as the login and site name).

• Pure Functionality: The system relies on a pure function; given the same input parameters (login, master password, site, and options), it will always return the same, unique password.

• No Database or Synchronization Required: LessPass is designed to operate completely offline and without a database. It does not need to sync your devices, eliminating common synchronization problems associated with traditional password managers. There is no need to save your passwords in an encrypted file.

Security and Openness

• Open Source: LessPass is open source (GPLv3 license), meaning the source code is available and can be audited.

• Brute Force Protection: To increase the cost of breaking the master password by brute force, the tool uses PBKDF2 with 100,000 iterations and the sha-256 hash function.

• Open Culture: The developers refuse to install cookies or analysis tools (like Google Analytics) on their applications. They document their algorithms, aiming for "no magic, no black box".

Availability and Features

• Wide Accessibility: LessPass is accessible via any device with a browser.

• Multiple Interfaces: Beyond the official website, it is available as an Android application, a Chrome extension, a Firefox extension, and a command line interface.

• Complex Rules Handling: It supports complex, site-specific password rules (e.g., length, requiring only numbers) through a "connected" version. This version saves a password's profile (including options like length or required character types), but excludes the master password and the generated password.

• Password Rotation: Users can generate a new password without changing the master password by simply incrementing the "counter" field in the options.

• Self-Hosting Option: Users have the ability to host their own LessPass Database if they do not wish to use the official one, requiring docker and docker-compose installed on their machine.

NewsletterHunt focuses on aggregating and managing newsletter content.

Its principal functionality is to:

• Create RSS-like feeds for all of your favorite newsletters.

The goal of this feature is to ensure that users never miss out on the news and updates that matter to you.

The Web Ahead is a podcast where the host, Jen Simmons, speaks with world experts on changing technologies and the future of the web. The show's mission is rooted in the desire to empower and challenge listeners as they build the web.

Core Focus and Content

The podcast delves into complex aspects of web development and design, covering 117 episodes and attracting 3.1 million downloads. Key content areas and featured topics include:

• Technology & Standards: CSS, HTML, Emerging Standards, Browsers, Performance & Dev Ops, and Tools.

• Design & Layout: Layouts, Responsive Web Design, Mobile, Typography, and Design.

• Strategy & Business: Content Strategy, Business, CMS, and Culture and Society.

Specific episodes highlight cutting-edge developments:

• CSS and Visual Transformation: Episode 117 discusses how CSS now allows web pages to transform default rectangles and squares into complex shapes like parallelograms, rhombuses, skewed boxes, circles, or any desired shape. This includes topics such as transforms, rotation, scaling, skewing, perspective, translation, clip-path, and shape-outside.

• Web Architecture: Episode 116 addresses the pressure to use JavaScript frameworks, focusing on the architectural style of the web and the appropriate role of each available technology.

• Future of Layout: Episodes 115 and 114 discuss the changing landscape of web page layout, suggesting that new CSS specifications are making previously impossible designs attainable and predicting this shift might be the biggest change to graphic design on the web in over 15 years.

Host and Production Quality

The show is hosted by Jen Simmons, an accomplished professional.

• Host Expertise: Jen Simmons is a full-stack designer since 1996, with expertise in HTML & CSS. Her professional background includes front-end development work for CERN, design work for Google and the W3C, and deep interest in content structure and innovating page layout.

• Interview Style: She is recognized as a master of the craft and a fantastic host. The conversations are described as insightful, incisive, and very human, offering a unique combination of details, context, values, and personality.

• Audience Experience: Listening is described as "going to the school of your dreams", offering practical, thoughtful, and diverse exchanges of ideas.

Recognition

The Web Ahead is highly acclaimed within the industry:

• It was the Winner of Podcast of The Year 2015 Net Awards.

• It is 100% recommended by guests and peers.

• It is praised for its in-depth conversations and for bringing the best in the field to share their knowledge.