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gears
Gears is an open source project that enables more powerful web applications, by adding new features to web browsers.
This site contains the source code, issue tracker, and wiki for 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/gears-users/
Developer IRC channel: #gears on irc.freenode.net
Contributor mailing list: http://groups.google.com/group/gears-eng/