I have been working on a plugin-based WM in C called nitro.

I've taken a lot of inspiration from tudurom's windowchef. But both of us are excited for nitro, because it may ultimately subsume windowchef entirely.

Conversely, I keep making really weird design decisions on it just because I can. (Like preprocessing all my files with M4 for type-safe generics and using Makeheaders to not deal with header files.) It's probably too much, but I keep having the inexplicable urge to do things at a high-level in C.

You guys can check it out at http://github.com/laserswald/nitro.