I've just released GooTool 0.10.0. This is the first release of the 0.10 series and it adds support for Mac OS X, preliminary suppport for the Linux beta, and a proper installer for Windows users.
I didn't get a chance to finish everything I wanted to, but I wanted to get the Mac port out as soon as possible. But there are a number of other changes too, read on for the changelog and roadmap. The goal is to complete all the new features in 0.10.x quickly and have a stable 1.0.0 release, so please report any bugs you find.
In other news, I've started documenting the game file formats on this site. I believe it's fairly straightforward for me to add people as editors, so just create an account here and let me know if you wish to contribute.