I don't use FreeCAD on a Mac myself, so I haven't been really motivated to provide regular builds. However, now that there seems to be more demand for them, I would like to volunteer to be the Mac OS X maintainer. I would take responsibility for providing regular builds and fixing Mac specific bugs. Unfortunately though, it will probably be at least a month before I will have the time to do regular builds, but I will try doing another build tomorrow.
I'm pretty sure the last build that I uploaded is way more stable than the 0.13 version (probably just because it is newer) and it is a smaller package. The only drawback is that it requires X11, which was a dependency pulled in by OCE. (Though, I discovered later that it is actually possible to compile all the needed OCE modules without X11). One more problem is that it can't be embedded into a different python program, without changing the RPATHs of the libraries.
I haven't updated the wiki instructions for building on a Mac, because my setup is highly customized and I wouldn't recommend it. FreeCAD actually builds fine a Mac. The hard part is creating an application bundle that users can run from anywhere on there system. It would be very easy to provide a Unix style install, but I don't think Mac users would like starting FreeCAD from terminal
I'm planing on making the "LibPack manager" I'm currently developing, work on Mac as well, which means I will be able to easily provide precompiled mac libraries. This way it will be easy for other people to compile on Mac.
So if you can hold on a bit longer, more Mac stuff is coming!