TermFu allows you to have access to all those long terminal commands that are so hard to remember. It's a client for the commandlinefu.com Web site where other users share those amazing "one-liners"
Cobra Command Tool is a terminal emulator with a lot of extra features. It includes a file tree browser, a file list browser, bookmarks, command lists, history files, support for Subversion and Clearcase, user-defined buttons, and much more.
A simple lock manager.
A LED matrix controller.