Letter: X
- x264 - H264/AVC video streams encoder
- xbmc - Media center
- xine-lib-extras-freeworld - Extra codecs for the Xine multimedia library
- xmltv - A set of utilities to manage your TV viewing
- xroar - A Dragon 32, Dragon 64 and Tandy CoCo emulator
- xtables-addons-kmod - Kernel module (kmod) for xtables-addons