This article is devoted to the transformation of Android-device remote control over torrent client running on a stationary PC or laptop, using a variety of applications and Web services. Below we consider various ways to solve this problem in relation to the most common programs/torrent clients for Windows, Linux and Mac OS X.
μTorrent 2.x
One of the most popular desktop torrent clients for Windows and Mac OS X is uTorrent which allows remote management via web interface, but only if PC on which you installed the program has the real IP-address. Otherwise, the mobile device should be with it in the same local network.
Management functionality through a Web interface has to be activated with the settings of uTorrent, passing your login and password for authentication:
Now in the address bar of your browser mobile device, enter the IP-address of the PC port (by default – the same as the port for incoming connections, see the settings for uTorrent) and the path/gui. In the dialog box, type the previous user’s data:

It should be noted that the interface of a remote control for uploads via uTorrent 2.x is clearly not designed for mobile devices, and almost completely repeats the appearance of the desktop application.

However, considering this fact, you should understand there are advantages: you can control virtually all settings of this BitTorrent client.
μTorrent 3.0 “Falcon”: the mobile web interface with no problems

The third version of a mini uTorrent client at the moment has Alpha version. In practice this means significant “raw” applications that support the emerging of updates every few days. However, uTorrent 3.0 Alpha is quite possible to use it.

One of the main pros of this application is the presence of remote management client via a web interface optimized for mobile devices supporting Android OS, without having to use a desktop PC real IP. To use this functionality, you must activate it in the options and choose a login and password:
Now start your browser Android-devices, go to link http://web.utorrent.com and enter the credentials listed above, and is listed on torrents (interface is clearly designed to please users iOS):

As at the time of writing the functionality is limited stop/start the download, as well as adding new ones (by specifying the URL of the file). This method of controlling the torrent client, in my opinion, it has the right to life.
Transdroid: one more “universal” client

This application is intended to remotely manage the various torrent clients including uTorrent, Transmission, rTorrent, Vuze, Deluge, KTorrent, Bitflu, Torrentflux-b4rt, qBittorrent etc. Also supports service Xirvik SeedM8, contributing to rent servers for file sharing (seedbox).

Opportunities Transdroid are enormous for torrent fans: it can start, stop, delete and add downloads, search for torrents on the web and view RSS-feed.
However, a noticeable advantage of this application is the ability to add a torrent file directly from the Android-based devices. To do this, either install a compatible Transdroid file manager (eg, OI File Manager) or use the Send-To-Function in any incompatible client. Perhaps the latter feature significantly adds Transdroid attractiveness compared to other similar solutions.

FreeTorrent
The only free client, which could still make it work, is FreeTorrent. This is an extremely simple application by interface where you can add a torrent file (it should already be downloaded) – and wait until it is booted.

However, FreeTorrent loses speed downloading some paid counterparts. No extra features – the selection of individual files from the torrent, set priorities, make lists – the application does not support.

Total impression: it is cheap and basically functional. If you need to download a torrent, and do not want to pay for it, this program is for you.