Red Torrent - Red Torrent is a lightweight BitTorrent client for Android smartphones and tablets. The app allows you to conveniently download torrents directly to your mobile device or SD card over your wireless data connection.
Please note that due to the high amount of traffic generated, a WiFi connection or unlimited data plan is recommended
3G Watchdog Pro - 3G Watchdog Pro is a data traffic monitor for Android. It can help you prevent exceeding your plan's limits by monitoring and predicting usage of your 4G/3G/Edge/GPRS internet connection.
3G Watchdog Pro allows you to quickly see when you are approaching your plan's limits via a status icon in the notification bar and home screen widgets