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VexFlow is an open-source online music notation rendering API. It is written completely in JavaScript, and runs right in the browser. VexFlow supports HTML5 Canvas and SVG.

VexFlowJavascript library for music notation and guitar tab.
Mohit Cheppudiraleft a comment
My kids started using this to train their voices, and within a week, they had both improved pitch precision and the ability to identify basic intervals entirely by ear.

Pitchy NinjaVoice and Ear Training for Musicians
Pitchy Ninja is a game that trains your ear and improves your voice with simple personalized singing exercises, giving you real-time feedback on your vocal precision and pitch accuracy.

Pitchy NinjaVoice and Ear Training for Musicians
