UTorrent is a freeware BitTorrent client currently for Microsoft Windows only. UTorrent is the smallest torrent client out on the net. Download Old Version of uTorrent for Mac OS X 10.4 Tiger (PowerPC) Skip Development Versions tead. Transmission has been built from the ground up to be a lightweight, yet powerful. The Transmission Project has updated the Mac OS X 10.4 Tiger BitTorrent client “Transmission” to version 0.70. It was designed to use as little of a computer’s resources as possible while offering equivalent functionality of heavily featured clients, such as Azureus or BitComet. The entire program is a single 576 KiB executable (as of January 2007). Transmission is a cross-platform BitTorrent client that is easy to use, lowest in memory usage, easy to interate into MAC OS X, and has all the features found in most BitTorrent clients.