Google Gears

Google Gears is an Open Source Web Browser extension that lets developers create web applications that can run Off-Line.

http://code.google.com/support/bin/topic.py?topic=11628

use SQLite

http://en.wikipedia.org/wiki/Gears_(software)

In late November 2009, numerous online news sources reported that Google is going to migrate to use Web Storage rather than Gears in the future. A Google spokesman later clarified that Google will however continue to support Gears to not break sites using it.