Dreadmyst is an online fantasy RPG running on its own engine. Customize your stats and abilities as you slaughter the aberrations plaguing a cursed land. Choose from four playable classes, level up, farm gear, run dungeons (PvE), and fight other players (PvP). Tab target combat.

Summary from PC Gamer:

This fantasy MMO looks like a mix of Ultima Online (because of the ye olde isometric stylings) and World of Warcraft (because of the combat). If you long for MMOs of yore and resent modern monetisation schemes, this is worth checking out. As an enthusiast project, the devs have "no plans to introduce paid content or monetization."