Frostum

Arcmaze is a free-to-play browser 3D MMORPG with first-person view and grid-based movement set in dark fantasy medieval world with multiple dungeons. Develop your character and explore the fantasy world of Arcmaze. Learn professions, craft items, build factories and trade to influence the player-driven economy of the game. Solve quests, crawl dungeons, uncover secrets and find treasures. You can play alone or create your guild and siege castles and factories.

Arcmaze

Monopoly IO is the classic board game built for the web, complete with fully online multiplayer. Compete and negotiate for properties online with matchmaking, or grab some friends and play in a private session.

Monopoly IO

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Woozworld is a social MMO based on fashion, fame, and talking to others. You can sell, buy and trade clothes, level up by doing quests, and customize your own rooms with furniture, wallpapers, and sky textures.

Sometimes there are also events where you get to meet the creators or the "celebrities" of WoozWorld such as Mya or Jay Wooz.

Nowadays, it's not just a game for kids, as many players online are over 18.

WoozWorld has never been dead, even if it hasn't been in the spotlight like some other social MMO's. There's always a 150-200 or more players online at once.

Trading Browser Games

Arcmaze

Monopoly IO

Wooz World