Forgotten Elements

Forgotten Elements is a totally free MMORPG (Hack and Slay) and runs with JAVA.

You can choose from among four character classes and dive into the world of Forgotten Elements, consisting of many areas and randomly generated dungeons.
Collect thousands of different items and teach your character mighty skills and enhancements.
You can also combine your skills with those from other classes and duel other players with a unique strategy.
Challenge other players at the PVP-Arena or invite them to trade valuable items and artifacts.

Minimum system requirements: 

A Java Runtime Environment

External links:
Developer: Magic Plains