What are some alternatives?
When comparing Bitford and Transmission, you can also consider the following products
PicoTorrent - PicoTorrent is designed to be a tiny, easy-to-use BitTorrent client with low memory usage.
qBittorrent - Lightweight and open source torrent client that runs on all major platforms.
dottorrent-gui - An advanced GUI torrent file creator with batch functionality, powered by PyQt and dottorrent.
Deluge - Deluge is a full-featured BitTorrent client for Linux, Unix and Windows.
Vuze - Vuze is a free BitTorrent client used to transfer files via the BitTorrent protocol.
LibreTorrent - LibreTorrent is a Free as in Freedom torrent client for Android 4 and later, based on libtorrent.