BiglyBT is a feature filled, open source, ad-free, bittorrent client.
Webtorrent
App to connects to both BitTorrent and WebTorrent peers and even play the files before downloading.
Transdono
Transmission is a cross-platform BitTorrent client.
Popcorn Time
Popcorn Time Rojoj Senpagaj filmoj kaj televidaj programoj de torentoj.