MIKMIDI is an easy-to-use Objective-C MIDI library by Mixed In Key. It's a Cocoa-like set of Objective-C classes useful for programmers writing Objective-C OS X or iOS apps that communicate with external MIDI devices, including DJ controllers, keyboards, etc. MIKMIDI is still under heavy development, and more features will be added in the coming days and weeks.
MIKMIDI can be used in projects targeting Mac OS X 10.7 and later, and iOS 6 and later.
MIKMIDI is released under an MIT license, meaning you're free to use it in both closed and open source projects. However, even in a closed source project, you must include a publicly-accessible copy of MIKMIDI's copyright notice, which you can find in the LICENSE file.
If you have any questions about, suggestions for, or contributions to MIKMIDI, please contact the author. We'd also love to hear about any cool projects you're using it in.