Roll20 is described as 'The free, easy way to play tabletop games (such as pen and paper RPGs) online with others. It's completely web-based, so it runs right in your browser. It supports video and voice chat, background music, character sheets, a massive art library, and more!' and is a virtual tabletop in the games category. There are more than 50 games similar to Roll20 for a variety of platforms, including Web-based, Windows, Android, iPhone and Linux apps. The best Roll20 alternative is MapTool, which is both free and Open Source. Other Roll20 like games are Fantasy Grounds, Foundry Virtual Tabletop, Meridian Realms AI and DiceRight.