Seif Lotfy <seif@lotfy.com>
Siegfried-Angel Gevatter Pujals <siegfried@gevatter.com>
Michael Hruby <michal.mhr@gmail.com>
Manish Sinha <manishsinha@ubuntu.com>
Stefano Candori <stefano.candori@gmail.com>

From the Python implementation:
 Markus Korn <thekorn@gmx.de>
 Mikkel Kamstrup Erlandsen <mikkel.kamstrup@gmail.com