Source ports with WebGL support

Does anyone know any good source ports that support emscripten builds?

Fraggle was musing about getting Chocolate Doom running on Emscripten.  There's also Alon Zakai's port: https://github.com/kripken/boon .

A year ago I played around with Emscripten and managed to compile a Doom port for it, but I had to go back to the super old original SDL Doom port since it was the only one I could find that used (more or less) a simple Makefile.