Letter: X
- xcpc - A portable Amstrad CPC464/CPC664/CPC6128 Emulator written in C
- xmms-uade - Unix Amiga Delitracker Emulator XMMS plugin
- xmms2-nonfree - Nonfree plugins for XMMS2
- xrick - A clone of the game Rick Dangerous
- xv - Interactive image display program for X
- xv-doc - Documentation files for xv image viewer