[weland]

Lua is pretty widely used. C is also favoured but it's pretty easy to misuse so there are teams that shy away from it. I've seen Perl, Python and PHP, too, as well as some obscure languages. I distinctly remember seeing Tcl, but I don't remember the context so I might be bullshitting here.

It greatly depends on flash and RAM though. Past a certain point, Python or PHP are just too large.