Most modern BT Clients can be used with this tracker. I say most because there is a built in client ban that rejects the following clients...
BitComet and most BitLord versions:
All Torrentstorm versions
This is due to cheating modifications made available to some of those clients, while others just don't report your stats correctly to the tracker.
Thanks to Hal at http://www.bootcity.org
for this list!