Extreme programming is lacking a good tool. Its difficult to keep an overview when your not sitting at the keyboard. When hitting pageup/down the observer quickly looses his bearings. What is needed is animation, scrolling, folding and refactoring.
Diakonos is a customizable, usable console-based text editor. Scripting, bookmarking, regexp searching, parsed indentation, macros, a multi-element clipboard, multi-level undo, a customizable status line, keybindings, syntax highlighting.
nhtsclient is a ncurses-based client for the realtime multiplayer trading game Holsham Traders
Rinle is a tree-based editor written in Ruby that directly builds a program tree instead of using the commonly found line-based approach for developing software. This enables fast and powerful manipulation of code without finger breaking shortcuts.
A pluggable jukebox, in which the components talk XMLRPC to one another. This lets you have multiple UIs, multiple player types, multiple queueing systems. The ultimate conclusion would be a build your own jukebox kit. Includes a back end that Gronk! can