AndStatus is a light-weight Twitter, pump.io and StatusNet client for Android 
([http://identi.ca/ identi.ca] is now one of the sites of the [http://pump.io/ pump.io social network]). 
It features multiple User accounts in all supported Microblogging systems and allows you to work offline, including reading and blogging/sending messages while you are offline. Open Source License.

For more information please read the [https://github.com/andstatus/andstatus/wiki AndStatus Wiki].