"A fantasy d20-themed dungeon crawler", to quote DarkGod's comment. Inspired by Incursion by Julian Mensch. Made available under Open Game License. This is a non-profit fan project. No money is made. There are currently only two people working on the mod. However, we have released several beta versions so far.
This fighter has a heavy warhorse for a mount. If the player clicks the mount button, the fighter will perform accordingly - his speed will be increased and the horse will disappear from screen. Another click will then dismount, making the horse show back up.