The Best MIDI Keyboard Software (Windows, Mac, Linux, Android, iOS) - Musician Wave
Amazon.com: IK Multimedia iRig Keys I/O 25-keys Midi Controller with 24-bit up to 96kHz Audio Interface for iPhone/iPad, Android and Mac/PC : Everything Else
Amazon.com: IK Multimedia iRig Pads MIDI groove controller, portable & lightweight MPC-style beat machine with 16 velocity-sensitive backlit rubber pads - studio equipment for iPhone, iPad, Android, Mac, PC : IK Multimedia: