MacTorrent
The only BitTorrent client for Mac OS 8 - 9.2.2!
MacTorrent is a BitTorrent client written with REALbasic for Mac OS 8 through 9.2.2 as well as Mac OS X Panther (10.3.x) through El Capitan (10.11.x).
MacTorrent offers basic BitTorrent functionality and even works on low end G3's.