What are some good and fun horse online games

In my opinion, these two games are the best:

Howrse.com (text based horse game, no download or payment required - manage your own equestrian centre by boarding other players' horses, hiring staff, buying meadows and building stables, as well as breeding your own horses and caring for them and competing with them. Also have a job in an equestrian centre as either a groom, horse riding instructer, farrier or saddler, and board your horses in an equestrian centre, complete objectives and interact with other players.)

HorseIsle.com (virtual world based horse game, no download or payment required (although I think you need to have Flash Player 9 or above in order to play, which most computers have anyway) - Direct your character by using the arrow keys on your keyboard in a virtual world. Either walk or ride horses, visit various towns on many different islands and terrains, such as in the desert, forests, snow, grass and on roads. Take part in challenging quests and riddles with your horses, craft items, and interact with both in-game characters and other players.)