Editors' Note: The "Download Now" link directs you to the iTunes App Store, where you must continue the download process. You must have iTunes installed in order to open the link, and you must have an active iTunes account to download the application. This download may not be available in some countries.
OSCemote for iPhone is a remote control application for the iPhone. It lets you send Open Sound Control messages to other programs like Max/MSP, Puredata, OSCulator, etc. Those programs then play music or respond to the remote control however you want them to. Open Sound Control is a modern networked cousin of MIDI.