What are some alternatives?
When comparing Tuxemon and Pokemon World Online, you can also consider the following products
PokeMMO - PokeMMO is an Amazing, Action-Adventure, Massively Multiplayer Online, Role-playing and Puzzle video game that provides with the same mechanics and gameplay as Pokemon.
EvoCreo - Embark on a journey through the world of Zenith.
Pokemon Showdown - Pokemon Showdown is a 2D, Fighting, Single and Multiplayer video game.
Monster Park - Lovable monsters are out there! Walk into the meadow and catch 'em all!
Battle of Beasts - Battle of Beasts is an Amazing, Monster Hunting, Online, Brower-based, Single and Multiplayer video game.
OpMon - An open source Pokemon clone, with monster fights