PianoCrumbs.com is described as 'Piano Crumbs - The only interactive piano player online. Play along your favorite songs' and is an app in the Audio & Music category. There are five alternatives to PianoCrumbs.com for a variety of platforms, including Mac, Windows, Linux, Online / Web-based and Android Tablet. The best alternative is Synthesia, which is free. Other great apps like PianoCrumbs.com are Musicope (Free, Open Source), Pianu (Freemium), Playground Sessions (Paid) and PianoBooster (Free, Open Source).
What is pianu? Pianu is a website that teaches you how to play piano, interactively. How can a website teach me piano interactively? Using new technology in the browser, Pianu is able to interact with any MIDI keyboard connected to your computer.
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.