We implemented FairTorrent inside the python BitTorrent code, as well as the Azureus 2.5.4 and 3.0.4.2.
You can download the FairTorrent implementation based on the Azureus 3.0.4.2 code base here. (md5sum of the archive)
Please email Alex Sherman: asherman AT cs DOT columbia DOT edu with any questions or comments about the code.
FairTorrent Downloads: