R2 Online is a free to play 3D MMORPG with a strong emphasis on siege based PvP. R2 Online features not only various battle system such as PvP in open fields, GvG and Castle Siege but also great action animation.
Trove is a Voxel-based MMO that regularly generates exciting new worlds. It features free-form exploration , and enables community contributions to significantly impact the game through player created creatures and environments. Player can adventure through unlimited dungeon variations, discover an endlessly increasing supply of loot, and harvest resources to craft a variety of useful and powerful items. They can also create their own trans-dimensional home via a base that persists across worlds and servers, is completely customizable, and will grow and travel with you throughout your adventures.
World of Warships is a free-to-play 3D naval action MMO based on epic sea battles of the 20th century. World of Battleships will let players take control of a large selection of warships and wage naval war in scenarios based on the biggest boat battles of the 20th Century.