qBittorrent – Free, fast and reliable alternative of uTorrent & BitTorrent

It was originally written in C++ by Christophe Dumez (from France) in 2006 when he was a student. Now it's maintained by worldwide volunteers on their spare time. qBittorrent is a free, open-source and cross-platform BitTorrent client (torrent file downloader) with nice UI based on Qt and built-in search engines.