c-pluff: a smart C plugin framework

Here. With a MIT license, which is great. Looks very much interesting - the plugins can provide their own extension points, so one can build the "layered" functionality. From reading the docs it looks terribly interesting (although I dislike the XML, but well, it's a standard). I'll put this on the backburner and see if I can test it out one of these days with respect to the performance / etc. Or if you had any experience with it - leave a comment here.