I've written a program that I could do with testing on non-Linux systems e.g. BSD, Solaris, whatever. I have no idea whether it will compile on any other platforms, so would be interested to see if it does.
It's just an animated character that sits on your desktop and listens for news broadcast from a server online, though that's not really important. I don't need the program tested, I just need to know if it will build at all.
If you have X + gtk installed, and would be interested in helping, just say and I'll put the source tarball online somewhere. It's only about 500k.