What is PianoBooster?
Piano Booster lets you practice and play the piano alongside a scrolling music stave. It's an open-source, cross-platform tool that works with MIDI keyboards as input. Play along and receive an accuracy reading to let you know how you're doing.
Comments and Reviews
Said about PianoBooster as an alternative
It loads midi files and let you practice with a MIDI input (or even with your PC keyboard)