
Adventure Quest Worlds: https://www.aq.com/
Battle Royale :
Club Penguin:
Dragon Fable: https://www.dragonfable.com/
Dungeons and Dragons: https://roll20.net/
Pokemon Showdown: https://play.pokemonshowdown.com/
RuneScape: https://www.runescape.com/splash
TL; DR eat people, get big:
ToonTown: https://www.toontownrewritten.com/
Warframe: https://www.warframe.com/