Even I've been looking for a good product that does this! The only one I've found so far is http://www.ohloh.net http://www.ohloh.net As an example take a look

Even I've been looking for a good product that does this! The only one I've found so far is http://www.ohloh.net http://www.ohloh.net As an example take a look at my contributions to Rails: http://www.ohloh.net/p/rails/contributors/146029001134 http://www.ohloh.net/p/rails/contributors/146029001134 and my profile: http://www.ohloh.net/accounts/rohitarondekar http://www.ohloh.net/accounts/rohitarondekar It does more then keep track of contributions but that's the most useful feature at ohloh at present.