RawTherapeeRAW photo processing program with an exceptionally deep engine — advanced demosaicing, colour science and detail recovery that rival commercial developers. Preferred by photographers who want full technical control of their negatives.rsyncThe classic tool for efficient file synchronisation and backup, transferring only the differences between source and destination with its delta algorithm. For nearly three decades the workhorse behind mirrors, backups and archives everywhere.RustSystems programming language begun at Mozilla that guarantees memory safety without a garbage collector through its ownership model. Now under the independent Rust Foundation, it is the first new language admitted into the Linux kernel.ScribusDesktop publishing application for professional page layout, with CMYK colour, spot colours, ICC management and press-ready PDF output. Newspapers, magazines and books have gone to print from Scribus since 2001.SearXNGSelf-hostable metasearch engine that queries dozens of search services and returns combined results without profiling, tracking or ads. Hundreds of public instances give users a search box that answers to no advertiser.ShotcutCross-platform video editor from the author of the MLT framework, with wide format support through FFmpeg, 4K workflows and a dockable interface. A capable free editor with no watermarks, trials or upsells.ShotwellGNOME's photo organiser for importing, tagging, basic editing and publishing personal photo collections — the quiet default through which countless family archives have been kept in order.Signal DesktopDesktop client for the Signal messenger, whose end-to-end encryption protocol became the gold standard adopted even by proprietary competitors. Developed by the non-profit Signal Foundation with fully published source code.SQLiteSelf-contained, serverless SQL database engine — a single small library that is likely the most widely deployed database in the world, embedded in every browser, phone and countless applications. Its public-domain code and decades-long stability guarantee make it a model of software meant to last.SyncthingContinuous peer-to-peer file synchronisation that keeps folders identical across devices without any central server — encrypted, open protocol, no account required. A working demonstration that "cloud convenience" does not require surrendering your data.tmuxTerminal multiplexer that splits one terminal into many persistent sessions, windows and panes — work survives disconnects and continues exactly where it stopped. Indispensable for remote administration.Tor BrowserHardened Firefox bundled with the Tor anonymity network, routing traffic through three encrypted relays so neither websites nor networks can identify or track the user. For journalists, activists and citizens under censorship it is often the only usable window to the open internet.TransmissionLightweight BitTorrent client known for its minimal resource use and clean native interfaces on every platform, plus a headless daemon widely run on servers and NAS boxes. A quiet workhorse of file distribution since 2005.TypstModern typesetting system compiling readable markup to print-quality PDF with instant preview — a fresh, fast alternative to LaTeX whose compiler is fully open source.ValkeyHigh-performance in-memory key-value store forked from Redis under the Linux Foundation when Redis abandoned its open source licence in 2024 — the community and major cloud providers moving as one to keep the software free.VimThe ubiquitous modal text editor, Bram Moolenaar's 1991 improvement of vi, present on practically every Unix-like system in existence. Distributed as charityware supporting children in Uganda, it shaped how millions of programmers edit text.VLC media playerCross-platform media player and streaming server from the VideoLAN project that plays virtually every audio and video format out of the box, with no external codec packs. Born as a student project at École Centrale Paris, it became one of the most widely deployed free software applications in the world.VSCodiumCommunity build of the VS Code source tree with Microsoft's telemetry, branding and proprietary licence removed — the same editor, but actually free. A textbook example of why source availability alone is not enough without free binaries.WordPressThe publishing system behind roughly four in ten websites — a 2003 fork of b2/cafelog that grew into the world's most widespread CMS. Its GPL licence and open plugin ecosystem have kept an enormous share of the web on free software foundations.zathuraMinimal keyboard-driven document viewer for PDF, DjVu, PostScript and EPUB, with vim-style navigation and a plugin-based rendering backend. A small tool that does one thing precisely.
