Seizer
Seizer lets you play the tile laying board game Carcassonne online for free, in any browser, with nothing to install and no account needed to start. Find a live opponent in seconds, play slow turn based games with friends over days, or warm up against bots at several skill levels. Tiles snap only into legal spots and meeple spots light up after you place, so first timers learn the rules by playing. River, inns and cathedrals, and traders and builders expansions are included for free. Private rooms, a leaderboard, tournaments, and native iOS and Android apps round it out. An independent fan project, not affiliated with the official publisher.