
RF Online is a Scifi-Fantasy MMORPG. It was once one of those games where you had to pay monthly (like most MMORPG's), but they are now allowing users to play for free. I downloaded it and tried it out. It's actually quite fun. There's 3 classes (factions) to choose from:
Accretia

BellatoThe Accretian Empire follows a totalitarian regime where goals are for the Empire, a thought that is embraced by its followers. There is no feeling when it comes to the destruction of other races and for good reason, for the Accretia are a race of mechanised units with a materialistic thinking. The Accretia are proud to be the strongest and most formidable race in the galaxy, and are proud of the huge weapons they have created to kill men, women and all things living. Their need to expand to the further reaches of the universe to become even stronger is paramount and a key driving force to their being. This has inevitably led them to the Planet Novus and the arcane civilisations it plays home to.

Cora
The Bellato Union utilise machines and some magic in their culture. Renowned for their great mechanical minds, intelligence and hand-eye coordination, the Bellato can construct huge armoured battle mechs and weapons to use in the war. Though they are physically strong and intelligent, the huge gravitational energies from their home planet have left the Bellato with smaller builds. The Bellato are experienced traders and their financial minds and greed have driven the need to extend out to other planets, to colonize and claim resource. To expand to the rest of the universe, the Bellato have to ensure that the Novus Sector doesn't fall under the supremacy of the Accretia or Cora. This desire to expand and grow will no doubt leave the galaxy engulfed in turmoil and chaos.

The Holy Alliance Cora is a spiritual civilisation with a firm belief in religion and the magical arts. Though the history of the Cora has been built on religious wars, which has created multiple states and nations, the country is strongly unified through its core religious beliefs. The Cora people, united as the Holy Alliance, now battle for their survival using the magical powers drawn from their spiritual beliefs, and traditional weapons blessed by their god, Disem.
Screenshots:






The game has pretty nice graphics, however, this doesn't mean you can not play. You can turn the graphics down a bit so medium ranged computers can play it just fine.
Download
You also need to make a COG (Codemasters) account to use in the actual game here:
https://cogaccounts.codemasters.com/account-signup.php
And, lastly, you need to register the game with a key provided by the RF Online Website, which can be found here:
http://www.tryrfonline.com/splash.php?return=index.php?
(just click on the image and it should take you to a page where you can get a key generated).
I highly recommend making your account while the game client is downloading/installing/patching. It takes a bit for the account to go through the Codemasters servers.