Cocoatech has released a Finder replacement as partially as open source payware under a BSD license. It's interesting watching the traditionally Macintosh shareware world collide with the traditionally open source Unix world.

[via Ranchero]

Update: Neil Lee from Cocoatech wrote in to politely let me know that I didn't read closely enough. Only certain frameworks and other applications have been open sourced. Regardless, I think seeing more open source in the Mac world can only help everybody.