The last I looked at this, code still had to be written in C (which was actually kind of fun - wrote my own small framework).<p>Nowadays we get all the popular languages (<a href="http://gwan.com/faq#languages" rel="nofollow">http://gwan.com/faq#languages</a>) and as long as you're okay with freeware (not open-source), it's worth looking at for high-speed web calls.