AndStatus is an Open Source low traffic social networking client with tree-like threaded conversations. It supports multiple protocols, including GNU social (StatusNet, e.g. Quitter.se, LoadAverage, Vinilox, etc.), Twitter and Pump.io. AndStatus can combine your accounts from all networks into one Timeline, and it allows you to read and post even when you are offline.
For Android OS version 4.1 or higher. Under Free/Libre and Open Source License.
For more information please read the AndStatus Wiki.