KB Piano turns your computer into a piano. Just press the keyboard's keys, and the sound will play through your speakers. You can configure the software to play chords by pressing a single key. The software supports 15 channels and real-time mixing, so you can create MIDI files. Just press the keyboard's keys and you'll hear sounds coming out your speaker.

The license of this software is Free Trial Software, the price is $19.50, you can free download and get a free trial.