I'm a big fan of Alfred.app for OS X. When Alfred got extension support, I threw together some extensions that I found really useful. Now, I'm sharing them with you!
Take a look...
RhythmClicker is something I threw together because I had a hard time transcribing rhythms.
With RhythmClicker, you can click a button or tap a key to set a tempo, then as you click or tap your rhythm, it spits out the notes for you!
bash! is a basic web-based Terminal developed to help teach Mac users how to use the command line. It's in a very early form right now, but the following commands should work: