Hamb friendly phone apps.

I was looking at an app store, and noticed a few apps claiming to be used by Hambers, and I got to wondering what are the cool apps, that we would use?

I wanted one that made hot rod ring tones, and found one that amuses the hell outer me.

So, can we get a list of cool apps, that we could use, both for fun, and serious stuff, like the Tremec drive angle finder.

Oh yeah, and if someone already did a thread like this, I apologise.
I was to lazy to search.....