Screen is a web portal to the terminal! More importantly, it is a collaboration tool that allows users to share a terminal session online.
node.pl is a terminal based program which allows you to create graphs. You enter nodes (vertices) and connections (edges), and then view your data as you please!
Both directed and non directed graphs are supported. Features include, saving to file, merging files, undo, redo, custom color schemes, etc.
Go is a terminal utility that allows you to go to directories far from your current directory. One need only type the name of the directory, and go will search for it and take you there.