JamLegend is described as 'lets you play a rocking guitar game online for free. It features a limitless song library, massive multiplayer, tournaments and social features. Come Jam!' and is an app in the Audio & Music category. There are four alternatives to JamLegend for Windows, Linux and Mac. The best alternative is Frets on Fire, which is both free and Open Source. Other great apps like JamLegend are FoFiX (Free, Open Source), Performous (Free, Open Source) and Phase Shift (Free).