Galactic Conquest is a free massivley multiplayer online game where you get to build your own empire by researching and building.

This game plays entirely through your web browser so you can be up and running in a matter of minutes. There are various version of this game avilable to play depending on how much time you can put into it from once or twice a week to all day.

There is also a subscription option where you can get a few extras as well as help keep the game running but it is completey free.