Korbinian Rosenegger (large number of bugreports and patches)
Modestas Vainius <geromanas@mailas.com> (patches)
Alexander Wild <wild@te-elektronik.com> (patches)
+Adeodato Simó (patches)
+Alex Stansfield <alex@casualgenius.com> (patch)
+Martin Meredith (patch)
+Michael Bishop
+marlowe <marlowe@antagonism.org>
and several others (see the history in Bazaar for details)