Found this game and it seems quite fun. It's called Starmade and the best way to describe it is a cross between Minecraft and EVE Online. You can build spaceships, there are all kinds of components and weapons. Ship building can be fun, different computer modules link to different weapon and utility systems, I can see you could create *massive* ships if you wanted. You can build and set up factories to build parts or entire space stations. You can mine asteroids and stuff for materials. The world is massive too.
It still seems to be fairly early in development. With more features this could be a really fun game.
http://star-made.org/
