MumbleLow-latency voice chat server and client built for gaming and group coordination, with positional audio and strong encryption — self-hosted voice communication that predates and outlasts proprietary alternatives.MuseScore StudioMusic notation program for writing, playing back and publishing sheet music, paired with one of the largest open score-sharing communities in the world. Version 4 brought professional engraving and playback quality to everyone for free.MyPaintDistraction-free digital painting application built around an infinite canvas and an expressive brush engine (libmypaint) that other programs, including GIMP, have adopted. Beloved by artists for how little stands between pen and picture.NeovimCommunity-driven refactor of Vim with a Lua configuration language, built-in LSP client and an RPC API that lets the editor be embedded anywhere. It revitalised the modal-editing tradition for a new generation.Nextcloud ServerSelf-hosted file synchronisation and collaboration platform — files, calendars, contacts, talk and office editing under your own roof instead of someone else's cloud. Forked from ownCloud in 2016, it is the most widely used free alternative to proprietary cloud suites.NGINXHigh-performance web server, reverse proxy and load balancer engineered by Igor Sysoev around an event-driven architecture that solved the C10K problem. It serves a large share of the busiest sites on the internet.Node.jsJavaScript runtime built on the V8 engine that in 2009 brought the browser's language to servers and command lines, creating one of the largest software ecosystems ever (npm). Governed openly by the OpenJS Foundation.OBS StudioFree software for video recording and live streaming, with scene composition, mixing and hardware-accelerated encoding. It became the de facto standard tool of the streaming era while remaining fully open under the GPL.OkularKDE's universal document viewer for PDF, EPUB, DjVu, comics and more, with annotation, form filling and digital signatures — the first software ever awarded the Blue Angel eco-label for resource efficiency.OpenSSHThe OpenBSD project's free implementation of the SSH protocol — the tool through which virtually every server on the internet is administered. Developed with OpenBSD's trademark security discipline and audited relentlessly for over 25 years.OpenToonzProfessional 2D animation software descended from the Toonz system used by Studio Ghibli, open-sourced in 2016. A rare case of a production animation pipeline released for everyone to study, use and preserve.PandocThe universal document converter, translating between dozens of markup and document formats — Markdown, LaTeX, DOCX, EPUB, HTML and more. Written in Haskell by philosopher John MacFarlane, it is the Rosetta stone of document preservation.PidginMulti-protocol instant messaging client that connected AIM, ICQ, MSN, Yahoo, XMPP and more in one window. Its libpurple library and plugin architecture preserved interoperability through two decades of dying chat networks.PitiviGNOME's video editor built directly on the GStreamer multimedia framework, aiming for an approachable, well-integrated editing experience on the free desktop.PodmanDaemonless container engine that runs OCI containers rootless by default, closing the security gap of an always-on root daemon while staying command-line compatible with Docker.PostgreSQLAdvanced open source relational database with a lineage reaching back to the POSTGRES project at UC Berkeley in the 1980s. Renowned for standards compliance, extensibility and transactional integrity, it is the database on which much of the modern internet quietly runs.PythonGeneral-purpose programming language created by Guido van Rossum in 1991, whose readable syntax carried it from teaching language to the lingua franca of science, data analysis and machine learning. Developed openly by the Python Software Foundation.qBittorrentFree BitTorrent client built on libtorrent with an integrated search engine, RSS downloader and web interface — the community's answer to adware-laden proprietary clients. BitTorrent itself remains one of the great tools of digital preservation and distribution.QEMUGeneric machine emulator and virtualizer able to run software built for one architecture on any other — the backbone of Linux virtualisation with KVM, and the tool that lets preserved operating systems and software of the past actually run today.qutebrowserKeyboard-driven browser with vim-like bindings and a minimal interface, written in Python on Qt WebEngine. A living reminder that browsers can serve one focused idea of efficiency instead of the lowest common denominator.
