Play Some Drums - Virtual Instrument

Probably the most simple drum rompler available, this instrument only lets you adjust the volume of some elements of the drum kit, and adjust the reverb, that's it.

There are lots of more complete and interesting drum VSTs out there, but this one is so simple that it can be useful if you just want to sketch some drums for a quick demo.

Available for Windows and Mac, this little thing should work with most DAWs (except PT, of course...)