Bloodlines

Bloodlines is a really really cool free arena rts style game that is simply amazing.

This was released 4 days ago, and there are currently 16 heroes to pick and they will make more soon to come. So far, everything you can buy in the shop can be bought without paying real money, yet some of the items are quite expensive, but meh, it's a lot of fun.

Basically, you get 6 skills, and there is no mana, just cooldown based skills and an ultimate you get by using your abilities.

http://www.bloodlinechampions.com/thegame.php

^ sign up and play!

There also a couple of gamemodes, one that is an arena split into first of 3 rounds, and another gameplay similar to CTF.

Vampire: The Masquerade - Bloodlines
The superior Bloodlines game.