With Aria2Android you can run a real aria2, an open source download manager, executable on your device.

You can easily save session to pause downloads and continue them later and control your server through the JSON-RPC interface. 

Aria2Android works only on ARM devices.

This project is open source at https://github.com/devgianlu/Aria2Android
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aria2 is developed by Tatsuhiro Tsujikawa (https://github.com/tatsuhiro-t).