Rogue System is now available on Steam. Get it in Early Access and help guide development of this hyper-detailed space flight simulator.
Built with Leadwerks Game Engine, Rogue System's goal is to depict the possibilities of space exploration and combat within a realistic environment--choosing not to ignore the "science" in science-fiction. Key features do/will include proper orbital mechanics for all objects in space; detailed ship system control, functionality, inter-dependency and damage reaction; and the ability to move freely from one ship to another, EVA, and effect repairs while in flight.
http://store.steampowered.com/app/366000/