I thought I'd mentioned this here before, but I couldn't find anything, so here it is. It's old news, but not everyone is aware.
Infinity is a space MMORPG being produced by a small team of developers in their own time. You will have a great deal of freedom as far as what you do in the Milky Way, of which the whole galaxy is available for exploration. Purchase and upgrade your ships, set up deep-space and orbital satellites, trade, fight, form alliances, scheme, purchase planets and moons for your secret base or honest shipyard... etc. However, there is an overall plot about a mysterious fertility disease, and the search for the cure that is suspected to reside on the planet Earth, whose location has been carelessly forgotten.
Development has come along nicely, and combat prototypes have been pre-released for download.
What really sets this game apart, though, it its sheer scope. Although artificial entities such as ship designed have been designed, the natural galaxy, from nebulae to planets, are procedurally generated, yet will be the same for everyone who visits them every time. Astonishingly, upon arrival in a new solar system you can point your ship towards a planet and fly towards it, until such time as you have to pull up to avoid crashing into the beautifully rendered terrain. Space and planetary environments are joined seamlessly, mainly because there is no seam: just continuous universe.
And investigating those smooth rings, only to discover an asteroid field dominated by real-time Newtonian physics, is a joy to behold.
Infinity website
Wikipedia article
Official YouTube videos.