Fully-featured Java IDE written completely in Java, with many modules available, such as: debugger, form editor, object browser, CVS, emacs integration, scripting support, make, Ant, and unit testing. [Open Source, MPL-like] http://www.netbeans.org/
port to MacOS of one of the fastest Java compilers available. The source base for this program has only been modified to incorporate support for the MacOS file system. No changes to the core functionality have been made. Therefore, this is a compiler base http://www.uiuc.edu/~s-bytnar/projects/MacJikes/