Favorite piano app?

[GlassBullet]

I'm looking for a piano app and I was wondering what you folks like or what you recommend? I'm not looking for a teaching software, just something to mess around with.

 

[Pika]

[app]Amidio Inc. ★ piano pro[/app] if your looking for a piano to do techno/rave...

[app]Pianist[/app] if your looking for a classic piano.