Ryzom

Ryzom features open world gameplay. Instead of character classes, it has a unique system for character abilities that allows players to construct custom actions like spells or attacks in detail. The game world is complex modeled, incorporating realistic effects like changing weather and seasons. Computer controlled entities (‘mobs’) display complex behaviors, and animals will, for example, graze in herds or hunt in packs. Ryzom offers a scenario editor that lets players design their own areas that can be uploaded and played on the official server.