Cloudrum

This thing sounds awesome, but be careful using it in a track with the GUI open. Maybe it's just my setup that's shitty, but it's crashed REAPER 3-4 times on me now, with the GUI open, but goes fine when it's minimized.

New update fixes the crashing, and you're left with just the awesome sound. Fantastic.

Is this VST sample based, if so what instrument is used?

This is a good sounding tongue drum. It's fun to make music with.