I made some basic tutorials for modding Jedi Academy on a Mac. You’ll still need to look elsewhere for general stuff, but I’ll gradually be adding all of the Mac-specific stuff. Also included are some more up-to-date instructions for getting MacRadiant to work on 10.7 or 10.8.
Raven Software released the Jedi Academy and Jedi Outcast source code under the GPL v2. The OpenJK Github page is probably the best place to look for the latest community version. Currently the main branch doesn’t work on Macs, but Mac support will be merged in soon.
It’s not really important anymore with the aforementioned source code release, but I put the source for JKJALaunch up on my Github.