- GTK (GIMP Toolkit)
- X app development kit providing often used widgets (buttons etc). - XEmacs - Emacs: The Next Generation@
- NEdit.org
- Project to develop a multi-purpose text editor. - Eterm.org
- Colour vt102 terminal emulator intended as a replacement for xterm. - aumix
- Programme adjusts an audio mixer from X, the console, a terminal, the command line or a script. - Ygl
- Emulates SGI's GL routines under X11 - xvscan
- HP ScanJet scanning software for HP Workstations and Linux. - Zircon
- An IRC client written in Tcl/Tk for X Windows
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