Tabletopia is described as 'is the only free-to-play sandbox virtual table with 100% licensed board games made by professionals. Already 500+ games and counting!'. There are more than 10 games similar to Tabletopia for a variety of platforms, including Online / Web-based, Windows, Mac, Linux and Android. The best alternative is Tabletop Simulator. It's not free, so if you're looking for a free alternative, you could try Board Game Arena or FreeBoardGames.org. Other Tabletopia like games are Yucata (Free), Plutopoly (Free), SurReal Estate (Free, Open Source) and Vassal (Free, Open Source).
Tabletop Simulator is the only simulator where you can let your aggression out by flipping the table! There are no rules to follow: just you, a physics sandbox, and your friends. Make your own games and play how YOU want! Unlimited gaming possibilities!
With Board Game Arena you can play board games online with the whole world. It is a next generation game platform which makes online gaming simpler and more attractive: -- Nothing to install: play straight from your browser, from anywhere, at anytime.
FreeBoardGames.org is a free and open-source board game platform. Enjoy free high-quality games on any device that can access the web. Study how the games are made, change them, and contribute back to the community.
Vassal is a game engine for building and playing online adaptations of board games and card games. Play live on the Internet or by email. Vassal runs on all platforms, and is free, open-source software.
The CyberBoard board gaming system makes playing board games by mail and electronic mail a more enjoyable experience. The system allows you to easily graphically design the various parts of a board game on your computer.