Like everyone else in this thread, I can't really express how much I appreciate this little tool. I actually created this account to thank you, then I saw this guy:
Hopefully that will work, but I have no way to try myself. Sorry I can't be more help.
That's just what worked for me.
You'll need the Mono Runtime Environment ( direct download ), X11 ( direct download for OSX 10.6 and later, you may already have it installed ), and Biome Painter itself. Install X11 and Mono; unarchive Biome Painter. Open up Terminal and type "mono " and drag BiomePainter.exe into the window (this will fill in the path to Biome Painter) and hit return to run it. You should end up with Biome Painter running windowed. It will probably run a little sluggish, but it should otherwise work fine. It's important to note that you can't close Terminal until you exit Biome Painter.
2
That's just what worked for me.
You'll need the Mono Runtime Environment ( direct download ), X11 ( direct download for OSX 10.6 and later, you may already have it installed ), and Biome Painter itself. Install X11 and Mono; unarchive Biome Painter. Open up Terminal and type "mono " and drag BiomePainter.exe into the window (this will fill in the path to Biome Painter) and hit return to run it. You should end up with Biome Painter running windowed. It will probably run a little sluggish, but it should otherwise work fine. It's important to note that you can't close Terminal until you exit Biome Painter.