Metronome is, umm, a metronome for Mac OS X. (Requires Mac OS X 10.3 or later.) It's not perfect, but I think it's pretty good.

Change Case is a service with which you can change the case of selected text from the Services menu. There are five options: ALL CAPS, all lower, Word Capitals, tOGGLE cASE and camelCase.

CocoaAccessorWriter. If that name means anything to you, you may be interested in this. It's a free, but pale, imitation of the real thing, namely:Accessorizer, by Kevin Callahan.

Speed Match II is a tile matching memory game with a timer. My first programming effort. It ain't great, but it does work. (Requires Mac OS X 10.4 or later.)