DoTA

Closed beta is currently running on. It is said to be friends-and-family beta testing, still there are a lot of threads in the net that can grant you "working key generator" (I can't assure you that it does work, as I haven't tried), if you feel risky - go try.

Beta is already on the 3rd patch (v0.3).

If there will be OBT I'll post it here as soon as I'll know about it.