- [HelenOS](http://helenos.org), a portable microkernel-based multiserver operating system
- [HexChat](https://github.com/hexchat/hexchat), a cross-platform IRC client in C
- [IGT](https://cgit.freedesktop.org/xorg/app/intel-gpu-tools/), Linux kernel graphics driver test suite
- [inih](https://github.com/benhoyt/inih) (INI Not Invented Here), a small and simple .INI file parser written in C
- [Irssi](https://github.com/irssi/irssi), a terminal chat client in C
- [iSH](https://github.com/tbodt/ish), Linux shell for iOS
- [Janet](https://github.com/janet-lang/janet), a functional and imperative programming language and bytecode interpreter
@ -87,6 +91,7 @@ format files
- [mrsh](https://github.com/emersion/mrsh), a minimal POSIX shell
- [Nautilus](https://gitlab.gnome.org/GNOME/nautilus), the GNOME file manager
- [Nemo](https://github.com/linuxmint/nemo), the file manager for the Cinnamon desktop environment
- [OcherBook](https://github.com/ccoffing/OcherBook), an open source book reader for Kobo devices
- [oomd](https://github.com/facebookincubator/oomd), a userspace Out-Of-Memory (OOM) killer for Linux systems
- [OpenH264](https://github.com/cisco/openh264), open source H.264 codec
- [OpenHMD](https://github.com/OpenHMD/OpenHMD), a free and open source API and drivers for immersive technology, such as head mounted displays with built in head tracking
@ -106,6 +111,8 @@ format files
- [qboot](https://github.com/bonzini/qboot), a minimal x86 firmware for booting Linux kernels
- [radare2](https://github.com/radare/radare2), unix-like reverse engineering framework and commandline tools (not the default)
- [RxDock](https://gitlab.com/rxdock/rxdock), a protein-ligand docking software designed for high throughput virtual screening (fork of rDock)
- [scrcpy](https://github.com/Genymobile/scrcpy), a cross platform application that provides display and control of Android devices connected on USB or over TCP/IP
- [Sequeler](https://github.com/Alecaddd/sequeler), a friendly SQL client for Linux, built with Vala and Gtk
- [SSHFS](https://github.com/libfuse/sshfs), allows you to mount a remote filesystem using SFTP
- [sway](https://github.com/swaywm/sway), i3-compatible Wayland compositor
- [Sysprof](https://git.gnome.org/browse/sysprof), a profiling tool
@ -114,7 +121,10 @@ format files
- [Taisei Project](https://taisei-project.org/), an open-source Touhou Project clone and fangame
- [Terminology](https://github.com/billiob/terminology), a terminal emulator based on the Enlightenment Foundation Libraries
- [Tilix](https://github.com/gnunn1/tilix), a tiling terminal emulator for Linux using GTK+ 3
- [Tizonia](https://github.com/tizonia/tizonia-openmax-il), a command-line cloud music player for Linux with support for Spotify, Google Play Music, YouTube, SoundCloud, TuneIn, Plex servers and Chromecast devices
- [Valum](https://github.com/valum-framework/valum), a micro web framework written in Vala
- [Venom](https://github.com/naxuroqa/Venom), a modern Tox client for the GNU/Linux desktop
- [VMAF](https://github.com/Netflix/vmaf) (by Netflix), a perceptual video quality assessment based on multi-method fusion
- [Wayland](https://github.com/wayland-project/wayland) and [Weston](https://github.com/wayland-project/weston), a next generation display server
- [wlroots](https://github.com/swaywm/wlroots), a modular Wayland compositor library
- [wxFormBuilder](https://github.com/wxFormBuilder/wxFormBuilder), RAD tool for wxWidgets GUI design