Free and Open Source Software

posted by Rianne Schestowitz on Aug 30, 2026

• Schemathesis - property-based API testing tool

  Schemathesis is a property-based API testing tool for services described by OpenAPI or GraphQL schemas. It generates test inputs, adapts to server responses and chains operations into workflows designed to expose edge cases and undocumented behaviour.

  This is free and open source software.

• Bit - terminal-based ANSI logo designer

  Bit is a terminal-based ANSI logo designer and bitmap-font utility for creating stylised text.

  The software provides an interactive terminal interface for designing and previewing logos. It can also be used as a command-line tool for quickly rendering text or as a standalone Go library for adding ANSI text rendering to other software.

  Bit includes more than 100 bitmap fonts and offers gradients, shadows, scaling, alignment, spacing and kerning controls. Finished designs can be exported as images, plain text or source code for several programming languages.

  This is free and open source software.

• Vencord – extensible Discord client modification

  Vencord is an extensible modification for Discord’s desktop and web clients.

  It supplies more than 100 built-in plugins that alter the interface, add utilities, expose additional information or address limitations in the standard client. Users can enable individual plugins from a graphical settings panel instead of maintaining separate scripts. Vencord also supports custom CSS, compatible BetterDiscord themes and browser deployment through an extension or userscript. Privacy-oriented defaults block Discord analytics and crash reporting, and the project does not add its own telemetry. Development is exceptionally active, with frequent compatibility fixes following Discord interface changes. As with every unofficial Discord client modification, using Vencord contravenes Discord’s Terms of Service and therefore carries some account risk.

  This is free and open source software.

• TestCafe - Node.js framework

  TestCafe is a Node.js framework for automating end-to-end web testing. Tests can be written in JavaScript or TypeScript and executed across local, remote, mobile, headless and cloud-hosted browsers.

  This is free and open source software.

• Ucupaint – layer-based texture painting for Blender

  Ucupaint is a Blender add-on that adds a dedicated layer-based texture-painting workflow to materials used by Eevee and Cycles.

  Instead of asking artists to assemble and maintain an increasingly complex shader-node tree by hand, it presents material channels, layers, groups, masks and modifiers through a focused panel in the 3D View or Node Editor. The generated data remains inside the Blender project and participates in Blender’s normal painting, shading, sculpting and baking workflow. It supports current Blender releases while retaining separate packages for much older versions, making it unusually broad in version coverage.

  This is free and open source software.

• LXQt Organizer - lightweight personal information manager

  LXQt Organizer is a lightweight personal information manager written with Qt. It is maintained by the LXQt project but can be used independently of the LXQt desktop environment.

  The application is being developed around local storage of personal information. It already provides Vdir calendar and address book storage together with iCalendar parsing and serialization.

  Its storage layer also supports atomic writes, ETags and locking. LXQt Organizer remains under active development, with a broader set of calendar, task, contact, reminder and import/export functionality planned.

  This is free and open source software.

• Keysign – OpenPGP key signing helper

  It is intended for two people meeting to verify and certify one another’s identities. Rather than downloading a key from a public keyserver, the application obtains an authenticated copy directly from the other participant. The key can be transferred over the local network or Bluetooth. A QR code carries a message authentication code that confirms the transfer, while the fingerprint can be entered manually when it has been verified through another trusted channel.

  After the user checks the identities attached to the received key, Keysign certifies each user ID separately. It encrypts the resulting certifications for their intended recipients and opens the configured email client with a prepared message and attachment. This avoids storing SMTP credentials within the application. The graphical interface uses GTK 4 and Libadwaita.

  This is free and open source software.

• Dorion – lightweight Discord web client

  Dorion is a lightweight desktop wrapper for Discord’s web application, built with Tauri rather than Electron.

  Its small native shell is designed to consume less storage and memory while starting quickly on modest hardware. Dorion adds theme support, client modifications, configurable keybindings and Discord Rich Presence integration without replacing the familiar web interface. Shelter is included, while Vencord and Equicord can be selected as alternative modifications. Linux builds are distributed for several processor architectures, although an important limitation remains: voice calls are unavailable on Linux because WebKitGTK does not yet provide the required WebRTC support. Animated media can also expose WebKitGTK performance limitations on some systems.

  This is free and open source software.

• Akizip – graphical archive manager for GNOME

  Akizip is a graphical archive manager built for GNOME with GTK 4 and libadwaita.

  It uses the 7-Zip command-line engine bundled with its Flatpak package while presenting archive operations through an adaptive desktop interface. Users can create 7z, ZIP, and TAR archives, inspect their contents and metadata, and extract a wider range of formats supported by 7-Zip. RAR and several compressed stream formats are handled in read-only mode.

  Operations run through a background job queue, allowing lengthy tasks to report progress without freezing the interface. Compression settings cover the output format, compression level and algorithm, dictionary size, thread count, passwords, and filename encryption for 7z archives.

  This is free and open source software.

• GoSuki - local bookmark manager

  GoSuki is a local bookmark manager that tracks bookmarks across multiple web browsers and browser profiles.

  The software monitors browsers’ internal bookmark files and detects changes using the operating system’s native event notification facilities. It does not require a browser extension or a cloud account, and stores the collected bookmarks in a portable local database.

  GoSuki runs as a background service and provides a local web interface, a command-line utility and a terminal interface. It also supports synchronisation between devices, bookmark archiving and integration with external services.

  This is free and open source software.

• ArmorPaint – GPU-accelerated 3D texture painting application

  ArmorPaint is a graphical application for painting physically based materials directly onto 3D models.

  It is designed around GPU-accelerated interaction, allowing brushes, masks and material changes to be viewed on the model as work progresses. Projects combine paint layers with procedural material nodes, while baking and export tools help turn a model into a texture set ready for another renderer or engine. The public repository contains the complete source and Linux build instructions. Official ready-made binaries are sold to finance development, so users who want a no-cost build must compile the developer-oriented source tree themselves.

  This is free and open source software.