Jelmer Vernooij <jelmer@nl.linux.org> (Original author and maintainer)

Thanks to the following people for providing patches and useful bugreports:
Wilmer van der Gaast <lintux@debian.org> (debian package)
'igla' at #ctrlproxy (bug reports)
Emanuele Giaquinta (several patches)
Aron Griffis <agriffis@gentoo.org> (gentoo package, bug reports)
mibukyoshiro@altern.org (bug reports, setup script)
Stephane Lacoin <stephane@zoo-matic.homeip.net> (patch for DETACH command in the admin module)
Barnaba Marcello <vjt@users.sf.net>, original author of network-openssl.c
Elliot Murphy (patch)
Daniel Poelzleithner <ctrlproxy@poelzi.org> (several major patches, autosave/python module)
Sean Reifschneider <jafo@tummy.com> (.spec file, bug reports, doc update)
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)

gnutls.c and ssl.h were taken from libsoup, which is licensed under the 
GNU LGPL.