Letter: T
- terminatorX - Realtime Audio Synthesizer
- thoggen - DVD backup utility
- thunderbird-enigmail - Authentication and encryption extension for Mozilla Thunderbird
- torrentzip - Create identical zip files over multiple systems
- transcode - Video stream processing tool
- traverso - Multitrack Audio Recording and Editing Suite
- twolame - TwoLAME is an optimised MPEG Audio Layer 2 encoding library based on tooLAME