Flowkey - The easiest way to learn piano with your iPhone or iPad

Sibelius - Sibelius is a virtual score creation tool which allows composers to easily create new piano scores, developed by Avid.

La Touche Musicale - With La Touche Musicale, you can learn piano online easily with the songs you love. Discover a fun and effective learning method to progress very quickly.

music21 - Music21 is a Python-based toolkit for computer-aided musicology.

Virtual MIDI Piano Keyboard - Virtual MIDI Piano Keyboard is a MIDI events generator and receiver.

DaCapo Editor - DaCapo Editor is a free Open Source music sheet editor which allows to easily create nice looking partitions. It is available as a web application as well as a desktop application for Windows, MacOS and Linux.