Torrents are a great way for distributing software without setting up storage, servers and such, as they live in a network of peer devices, and your Frankenfile can get assembled chunk by chunk from various different places, making the torrent network very fast, and resilient too.
Granted, these are often used for distributing copyrighted material, but that doesn't change the fact how awesome the torrent concept is, and it is even more awesome that Android is allowing its existence regardless of the controversies surrounding torrents - and that's the strength of Google's mobile OS.
Android's torrent apps have been getting much better lately, supporting magnet links, and many other things you are used to with your desktop torrent client, so let's have a peak at what Android has to offer for downloading from peer-to-peer networks.
The best torrent apps for Android
double click to zoom in and out
The best torrent apps for Android
There is a Lite version of tTorrent, but it is limited to 250 kB/s download speeds, and is supported by (annoying) ads. The tTorrent Pro version is where it's at, since the app supports magnet links, torrent-in-torrent downloads, individual search with rich results list, browser integration, and many more options. Downloading to your memory card needs to be fixed in KitKat-laden phones without cumbersome workarounds, but other than that it's a great torrent download option for Android.
A relative newcomer to Android's torrent download scene, Flud is quickly becoming a user's favorite, with its simple, fast and clean interface, and the smorgasbord of features that are fully active in the free version. Flud sports partial downloads, a great torrent search engine, magnet links open within the browser, the ability to move the files while downloading, prioritize, set limits, and many more. Even the annoying "save to SD card" issue that has happened from KitKat onwards, by introducing a simple workaround. If you aren't annoyed by ads, Flud is perhaps the best free torrent client choice for you, and even if you are, a dollar for the paid ad-free version is nothing to tear your shirt about.
There's partial search, magnet links support, and aTorrent covers some torrent sites others don't, so what more can you want from it gratis. There are some issues with lag and force-closing with the latest version 188.8.131.52-184.108.40.206, so you are better off with the previous one for now, and if you've had it with ads support, you can always dole out for the PRO version.
Riding on the popularity of the uTorrent client for your desktop, the free mobile app lets you search for and download torrents with no limits, and even allows subscriptions. The three bucks asked for the Pro version are worth it, though, as the interface is as comfortable and polished as you are used on the desktop, there aren't any ads, and the uTorrent team introduced a battery-saving feature that suspends torrent downloads under a preset percentage drop.
The beauty of uTorrent Remote is that you can monitor what's happening with the torrent downloads on your computer running the excellent desktop client, pause, cancel and start downloads, search for torrents, and even stream those back to your Android device - pretty cool when you are away from your computer, even if it's just in the next room, or on the couch.
Unlike its desktop counterpart, here Vuze is clean, simple and very fast torrent downloader. It is refreshingly ad-free, and offers down/upload limits, as well as simplified search and discovery, and automatic start on reboot. Some more advanced features, like prioritizing downloads, or setting the number of simultaneous downloads, are missing, but it's a free no-ads app, so we can't be whining too much here.
Speedier than the most, aDownloader now offers video previews and playback while downloading, as well as a tablet interface optimization. The interface is getting a bit long in the tooth, but the app is light and functional, and downloads anything at will, to the extent that you'll find a lot of people swearing at aDownloader being better than the uTorrent juggernaut, so be sure to check it out, especially if you own an Android tablet.
SmartTorrent is a pretty functional torrent client with great interface, which, is, however, a bit sluggish, and hasn't been updated for quite a while. If you own an Android tablet, its worth checking out for the comfy interface, though.