µTorrent 22.214.171.124040 Beta + Portable | 2.3/3.9 Mb
µTorrent is one of the most popular BitTorrent clients, with plenty of features such as bandwidth prioritization, RSS auto-downloading, scheduling and Mainline DHT (which is compatible with BitComet, another well-known BitTorrent client), Protocol Encryption joint specification (used also by Azureus, BitComet) and peer exchange. uTorrent was written with efficiency in mind. Unlike many torrent clients, it does not hog valuable system resources - typically using less than 6 Mb of memory, allowing you to use the computer as if it werent there at all. Additionally, the program itself is contained within a single executable less than 3 Mb in size.