"So who are working on this project?"

Also check the member list at SourceForge.
Name Homepage Comments
Hongli Lai http://users.telekabel.nl/hongli/ Project maintainer and main developer
Simo Sorce http://www.geocities.com/SiliconValley/9757/ Author of GnoZip (not GnomeZip!)
Giovanni Corriga ???? Author and maintainer of tarlib, part of LibGarp.