Terminal Mixer allows sharing the stdin/out/err of a process through a Unix socket, TCP, or raw ethernet (the latter only on Linux). It allows sharing a pseudo-terminal as well, for terminal-aware applications.
termrec is a program for recording "videos" of terminal output. Read more
textutils resembles the GNU text file (actually, file contents) processing utilities. Most of these programs have significant advantages over their Unix counterparts, such as greater speed, additional options, and fewer arbitrary limits.
The Silver Searcher
The Silver Searcher is a code-searching tool similar to ack, but faster.
The Teleport command
The Teleport command is a replacement for the traditional cd command. More accurately, it's a wrapper around the cd command.
tmv renames files/directories according to sed script(s) and other transformations.
ttm is a very small and simple Perl program which acts as a command-line operated task manager.
ttyrec is a tty recorder. Recorded data can be played back with the included ttyplay command. Read more
Turbotail is a drop-in replacement for the original (GNU) tail program which uses the (SGI) FAM daemon instead of polling every second like the original tail does. This is much faster and more efficient.