Simple Extensible Build System
This is a little build system I was toying with way back in 2009. Build files are actually parsed as Python (making it easy to extend) and the system supports compiling cross-compiling to multiple targets at once, including compiling tools for the host platform and then immediately turning around and using them as part of the cross-build.
Neat, but you should NOT use this, because I'm not maintaining it. Instead, consider: