Jedi Academy has been released as open-source (GPL) by the developers. People have now created ports for both Mac and Linux which can be found here: github.com/JACoders/OpenJK
Precompiled binaries can be found here: builds.openjk.org/
(Had to remove protocol from the URLs, won't let me post them)
OpenJK is better than the version that comes with the game, even if you use Windows I recommend using OpenJK instead. It fixes bugs and lets you use 16:9 resolution and adds a lot of new graphics settings etc.