An advanced and multi-platform BitTorrent client with a nice Qt4 user interface as well as a Web UI for remote control and an integrated search engine. qBittorrent aims to meet the needs of most users while using as little CPU and memory as possible.
libtorrent is a C++ library that aims to be a good alternative to all the other bittorrent implementations around. It is a library and not a full featured client, although it comes with a working example client.
The main goals of libtorrent are:
* to be cpu efficient
* to be memory efficient
* to be very easy to use