Google Gears is an open source browser extension that lets developers create web applications that can run offline.

This site contains the source code, issue tracker, and wiki for Google Gears.

Other interesting places:

API documentation: http://code.google.com/apis/gears/

End-user download: http://gears.google.com/

Developer mailing list: http://groups.google.com/group/google-gears/

Developer IRC channel: #gears on irc.freenode.net

Contributor mailing list: http://groups.google.com/group/google-gears-eng/