Recommended Open Source

qBitTorrent

The qBittorrent project aims to provide an open-source software alternative to µTorrent.

Available on All Operating Systems

Transmission

A Fast, Easy and Free Bittorrent Client For macOS, Windows and Linux

Tixati

Tixati is a New and Powerful P2P System

Vuze

Vuze (previously Azureus) is a BitTorrent client used to transfer files via the BitTorrent protocol.

BitComet

BitComet is a free BitTorrent download client!

Open Source

rTorrent

Open Source BitTorrent Client for P2P File Transfer

Reported as Malware and Crypto Miner

uTorrent

Popular Torrent Client, Owned by the same company as BitTorrent