tn5250 is a 5250 terminal emulator, used for connecting to IBM's AS/400 (now known as eServer iSeries) midrange computers. tn5250 implements TN5250E, which means it is capable of device name selection, and printer sessions. The emulator supports color, 132 column mode, and most other features found in 5250 terminals and Client Access' 5250 emulator. While tn5250 is text-based application, a script is included to run it in an xterm properly. If you don't know what an AS/400 is, this program will probably not be of much use to you.
toast is a simple package manager for Unix. It automatically locates and downloads source code, determines how to compile it, installs each package in its own directory tree, and makes the resulting binaries available through an encap/GNU stow-like symlink tree. It also supports binary packages. It is often used to install and manage software in a non-root user's home directory.
tomo3D is a multi-platform voxel-based program for the viewing and manipulation of 3D tomographic reconstructions. It offers a refined toolset to identify blurred, hardly separable 3D objects. Its tools enable global image manipulation operations as well as local manual intervention.
toolwrap is a tool for managing package installation that extendes the functionality of Stow or Tinypackage. It makes it possible for different releases of a given application to coexist on a single workstation or be deployed on a file server. Policies files allow end-users to select which package is used when a tool is invoked from the command line.