midimouse for Mac

From zs_:

midimouse is a small, easy-to-use and very simple program. It sends MIDI-controller-messages (CC) by moving the mouse over its window. While moving the cursor (with or without mouseDown) over the X-/Y-axxis, each axxis sends a CC, so you might send values within up to 4 configurable Controllers.

So, what's it for if you've never heard of CC's?

You can make music with it! Just connect it as a MIDI-Controller (input) to your hardware-synthesizers or software-programs and you can control the effects by moving your mouse — on a small screensize or even on full screen. If midimouse is in “click-trough” mode, you can even still reach the underlying controls!

Features:

• Easy set-up
  (default CC's on CH 1: 12+13 without and 14+15 with mouseDown)
• CC Numbers are changeable
• Non-Activating window, so the current application remains the frontmost one, even if you click on midimouse's window
• Transparent window (0% - 95%), so you can see what's below

A demonstration video is available on the developer's site.

(Note: You need additional software to make musik. midimouse does NOT produce any sound!)