This is a list of public torrent trackers you can manually add to your torrent downloads using your client (e.g. uTorrent, Transmission, Vuze). You should leave a single blank line between each URL, otherwise these trackers will be ignored.
If a torrent tracker in this list appears to be offline, this might be a temporarily issue and it might come online again in a few hours or days. If you have more public trackers that are working as of 2015, please do add a comment below and let me know.
http://9.rarbg.com:2710/announce http://announce.torrentsmd.com:6969/announce http://bt.careland.com.cn:6969/announce http://explodie.org:6969/announce http://mgtracker.org:2710/announce http://tracker.best-torrents.net:6969/announce http://tracker.tfile.me/announce http://tracker.torrenty.org:6969/announce http://tracker1.wasabii.com.tw:6969/announce udp://9.rarbg.com:2710/announce udp://9.rarbg.me:2710/announce udp://coppersurfer.tk:6969/announce udp://exodus.desync.com:6969/announce udp://open.demonii.com:1337/announce udp://tracker.btzoo.eu:80/announce udp://tracker.istole.it:80/announce udp://tracker.openbittorrent.com:80/announce udp://tracker.prq.to/announce udp://tracker.publicbt.com:80/announce
Update, March 3rd: I added some new trackers and removed some non working ones as per the comments and feedback I received. The rarbg tracker seems to have multiple mirrors, such as udp://10.rarbg.me:80/announce and udp://11.rarbg.me:80/announce so you might try out these as well to see if they are working. If you have more working public torrent trackers that do function properly, feel free to suggest them in the comments.