I know there at least a few musicians around here.

What music apps do you guys use?
I've been getting a lot of use out of Pianist and Beatmaker. Every music should have those two.

I also have using ITM Matrix and ITM Midilab along with Logic.
Cleartune has been a great tuner for me.

I recently downloaded Synthpond and it's pretty interesting. It's mostly meant to just play around with, but it has some serious functionality as well.