So I got my mom's guitar up here with me at college, and I am messing around with it, but the problem is I can't get the tuner to work... embarrassing... but I can tune by ear. Anyone know of any apps that can help me with that that would include tunings for drop D and drop C?

Drop C!?!  Be sure you've got some heavy-gauge strings!

I'd check out http://www.gieson.com/Library/projects/utilities/tuner/

Oh ya! Drop C so I can play some August Burns Red. haha. It's low and brootal.