euphoria's Stars
Fudge/gltrail
Real-time web-server visualization using OpenGL and a force directed layout
caged/gitnub
A Gitk-like application written in RubyCocoa that looks like it belongs on a Mac. See the wiki for downloads and screenshots.
IoLanguage/io
Io programming language. Inspired by Self, Smalltalk and LISP.
defunkt/facebox
Facebook-style lightbox, built in jQuery