umm.. u can try Rythm Rascal.. its a good one.. or tabtrax.. thats also good.. u can convert drum tabs using the second one also..
i wud recommend not using specialized drum sequencers but getting the job done with more general tools like cakewalk pro audio or fruity loops. its more fun that way.
rythm rascal is also not free.. you can get a trial version of it heres the link anyways.. https://www.rhythmrascal.com/Download/RhythmRascalSetup.exe