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- Andrew Tanenbaum - Minix
- Audrey "Autrijus" Tang - designer of Pugs
- Simon Tatham - NASM, PuTTY
- Larry Tesler - the PUB markup language, the Smalltalk code browser, debugger and object inspector, and (with Tim Mott) the Gypsy word processor
- Jon Stephenson von Tetzchner - co-creator of Opera web browser
- Avie Tevanian - author of Mach kernel
- Ken Thompson - main designer and author of Unix, Plan 9 and Inferno operating systems, B and Bon languages (precursors of C), creator of UTF-8 character encoding, introduced regular expressions in QED.
- Michael Tiemann - G++, GCC
- Linus Torvalds - original author and current maintainer of Linux kernel and creator of Git, a source code management system
- Michael Toy - co-developer of video game Rogue
- Andrew Tridgell - Samba, Rsync
- Roy Trubshaw - MUD - together with Richard Bartle, creator of MUDs
- Bob Truel - co-founder of Open Directory Project
Read more about this topic: List Of Programmers