I wrote the Lua, Go, and Python examples handlers.
JavaScript, Lua, and Python can be linked directly with the server for performance you would not get via separate processes.
I had more difficulty with Go, which you can read about on the forum.[1]
They all work, but are just proofs of concept at the moment. G-WAN makes it easy to link with any C library, so it is not hard to use languages that expose a C API such as those listed. It is just a matter of writing a more complete handler.
[1]http://forum.gwan.com/index.php?p=/discussion/463/writing-g-...