Finally! Someone who agrees with me! I've mentioned wxWindows heaps of times on these threads, no-one seemed to care...
The wxWindows codebase compiles on HEAPS of different compilers too. Also, I the "universal" or stand-alone wxWindows project has it's own widget set it can render by itself, the idea being IIRC that you can just set it up with a framebuffer and it does the rest... intended for embedded apps methinks. This would be a good place to start, and then work towards a wxReaction or wxMUI, just like wxMotif or wxGTK+.
- Paul