Edgeworld is a science-fiction browser-based mmo strategy game. In the year 2711, the (somewhat unstable) galactic union has started to colonise the alien planet of Cerulea IV, which is now abandoned since its natural inhabitants, the Ceruleans, mysteriously vanished.
Without having to fight the Ceruleans, the union is now splintered into several factions, fighting each other. You get the role of a commander for one of the factions and you have to build your base, assemble an army, and try to dominate the planet.
The game has nice graphics and sound effects, as well as all the features you would expect from a strategy game (e.g. base building, resource management, army building, technology research, etc).