Best Free and Open Source Software, and Many More

posted by Rianne Schestowitz on Sep 29, 2026

• Ketchup - native Pomodoro timer for KDE

  Ketchup is a native Pomodoro timer designed for KDE. It implements the familiar productivity technique of alternating periods of concentrated work with regular breaks, while keeping the interface and configuration intentionally straightforward.

  The application is aimed at people who want a small dedicated timer rather than a broader project-management or task-tracking system. Focus and break durations are configurable, so users are not restricted to the traditional Pomodoro timings. Ketchup can also move directly to the next period after an alarm is dismissed, reducing the need to keep returning to the application between sessions.

  This is free and open source software.

• AIS-catcher - versatile AIS receiver for software-defined radio

  It turns VHF AIS transmissions into decoded vessel information that can be viewed locally, recorded or forwarded to other applications and services. The software is useful for hobby receiving stations, maritime research, coverage analysis and Raspberry Pi installations. It only receives radio traffic and is explicitly intended for research and educational use rather than navigation or other safety-critical applications.

  This is free and open source software.

• Ratio - WCAG colour contrast checker

  Ratio is a graphical colour-contrast validation tool intended for designers, developers and anyone checking an interface for accessibility problems. It applies the contrast calculations defined by the Web Content Accessibility Guidelines rather than relying on subjective visual judgement.

  The program focuses on three specific WCAG success criteria. These cover the contrast of normal text, the visibility of non-text interface components and the appearance of keyboard focus indicators. This makes Ratio useful when choosing foreground and background colours for websites, applications and other interfaces where sufficient visual distinction matters.

  This is free and open source software.

• syslog-ng - collect, process and route log data

  It extends the traditional syslog model into a general-purpose logging pipeline capable of accepting structured and unstructured input, extracting useful information and delivering the resulting messages to a wide variety of destinations. Administrators can construct processing paths to centralise logs from multiple hosts, normalise heterogeneous messages and forward selected data to storage or downstream analysis systems. Its configuration language allows sources, transformations and destinations to be combined into pipelines appropriate for anything from a single Linux machine to larger centralised logging installations.

  This is free and open source software.

• LettersFall 110% - educational falling-letter word puzzle

  LettersFall 110% is an educational word puzzle game that combines falling-block mechanics with English spelling. Individual letters descend into the play area and the player must assemble them into correctly spelled words before the accumulating letters become unmanageable.

  Its basic idea borrows from two familiar styles of game: the pressure of falling-block puzzles and the word-building challenge of board games such as Scrabble. The emphasis is on American English spelling, with a large bundled dictionary giving players a substantial vocabulary to work with. Difficulty and game modes can be changed to provide different levels of challenge.

  This is free and open source software.

• HexPatch - binary patcher and editor with TUI

  Rather than treating binaries solely as streams of bytes, the program brings architecture-aware analysis and patching tools into the same keyboard-driven interface. This makes it particularly relevant to reverse engineering, vulnerability research, binary modification and debugging, while remaining usable from a Linux terminal or remote shell session.

  This is free and open source software.

• Inscriptions - elegant DeepL translation client

  Inscriptions is a graphical translation application built around the DeepL service. Rather than using a web browser each time text needs translating, it provides a focused desktop interface for sending text to DeepL and displaying the resulting translation.

  A DeepL API key is required, and the program supports both free and paid API accounts. Its available source and target languages therefore follow those offered by DeepL. Inscriptions deliberately keeps its own scope narrow, concentrating on making routine text translation quick and uncomplicated rather than trying to become a broader language-learning suite.

  This is free and open source software.

• Minisforum Says Disable Four of the MS-R1's 12 CPU Cores - Is Linux Scheduling Them Properly?

  Modern Linux supports heterogeneous processors and knows that individual CPU cores can have very different performance capabilities. Its scheduler is supposed to take those differences into account. If Linux understands the MS-R1’s CPU topology properly, keeping all 12 cores enabled should give us the best of both worlds: demanding work should gravitate towards the eight Cortex-A720 cores, while the four Cortex-A520 cores remain available when extra parallelism is genuinely useful. That’s what I’m going to test.

• vsFetch - graphical Linux system information viewer

  vsFetch is a graphical system information utility inspired by Fastfetch but designed around a GTK desktop window rather than textual command-line output.

  It acts as an attractive “About This Computer” panel, combining hardware information with details about the current desktop environment, shell, terminal and development tools. The program is highly customisable, with alternate layouts, theme inheritance and decorative background effects, so it can serve both as a practical system profiler and as a personalised desktop information display.

  This is free and open source software.

• Bing-r - desktop IPTV and media player

  Bing-r is a desktop IPTV and media application for Linux. It is designed for people who already have legitimate playlist sources and want a native application for organising, browsing and playing live television and other streamed media.

  The program imports M3U and M3U8 playlists from local files or remote URLs and builds a local media library from their contents. Channels can then be browsed and filtered instead of forcing users to work directly with large playlist files. Bing-r does not provide television channels, subscriptions or copyrighted media itself.

  This is free and open source software.

• vat - render vector graphics in your terminal

  vat is a focused command-line utility for viewing vector artwork without opening a conventional graphical image viewer.

  It takes vector graphics and rasterises them for display directly inside a terminal supporting the Kitty graphics protocol. Its supported inputs make it particularly interesting to developers working with web, Android and Jetpack Compose graphics, as the same tool can inspect SVG files, Android Vector Drawables and Compose ImageVectors. Compatible terminal emulators include Kitty, Ghostty and WezTerm.

  This is free and open source software.

• 7 Best Free and Open Source Chemical Structure Drawing Tools

  The software is principally aimed at chemists, biochemists, researchers and laboratory scientists, but it is equally relevant to university lecturers, teachers and students studying chemistry or related subjects. Scientific authors can use these tools to prepare figures for papers, reports and teaching material, while developers and researchers working with chemical databases may find their import and export capabilities particularly useful. They can also be valuable to anyone who regularly needs to illustrate molecules or chemical reactions without relying on proprietary chemistry software.

  Here’s our verdict captured in a legendary LinuxLinks-style ratings chart. Only free and open source software is eligible for inclusion here.

• Best Free and Open Source Alternatives to Adobe Connect

  Hosts can prepare reusable virtual rooms, arrange presentations and interactive tools in different layouts, run polls and breakout sessions, and record what happens. Adobe provides a browser client for Linux, although there is no Linux desktop application. Connect remains proprietary, paid software.

  The open source alternatives approach the job from different angles. Some are built for teaching, while others are better suited to webinars or everyday meetings. They can be hosted on Linux and used from a Linux browser. Only free and open source software is eligible for inclusion here.

• dz6 - Vim-inspired terminal hex editor

  dz6 is a terminal-based hex editor inspired by Vim and designed for fast, keyboard-driven work with binary files.

  It fits workflows such as reverse engineering, malware analysis, forensics and low-level programming, where moving quickly between offsets and inspecting raw data matters more than a graphical interface. The program keeps interaction compact and predictable, with commands that will feel familiar to Vim users without trying to reproduce Vim in full.

  This is free and open source software.

• Era - responsive calendar for everyday planning

  Era is a graphical calendar application designed to work equally well for quick everyday scheduling and more involved planning. Its interface is responsive, so it can sit in a small window alongside other applications or expand to provide more space when managing a busy calendar.

  The application can synchronise events with supported online calendar providers while retaining offline access. Under the hood, its calendar architecture is modular, with Evolution Data Server providing integration with established calendar services. The interface uses GNOME technologies and is intended to work across both conventional desktop displays and smaller form factors.

  This is free and open source software.

• Colorice - wallpaper-driven Linux colour scheme generator

  Instead of performing its colour calculations directly in RGB or HSL, it uses the Oklab colour space, which is designed so that numerical differences correspond more closely to perceived differences between colours. The resulting palettes can then be rendered into configuration files for applications across a Linux desktop. Colorice also offers compatibility with existing pywal templates, making it possible to reuse established customisation setups rather than recreating them from scratch.

  This is free and open source software.

• gittuf - security layer for Git repositories

  The software is platform-agnostic. Its security controls are not tied to GitHub, GitLab, Bitbucket or another forge, allowing developers who can pull a repository to independently verify that changes followed its security policy.

  gittuf uses cryptographic signatures to authenticate actors and maintains a Reference State Log that records changes to Git references. It can also use in-toto attestations to record repository activity such as code review approvals.

  This is free and open source software.