The clientsidedb project provides a library for Google Web Toolkit applications that delivers a database interface to the browser. The goal of the library is to mirror the complete database on the client, i.e. the browser. All clients receive database changes via server side push operations, i.e. from the perspective of a library developer no polling is involved. Since the database is mirrored on the client, users do not have to wait on RPCs to complete.
At one point, Open Hub analyzed source code for this project based on code location(s) available at that time. Since then, the code locations have been removed.