Kevin Crawford had an amazing product with Stars Without Number and has surpassed that product with his Revised Edition. It is an elegent d20 system with some amazing classes. It is also quite easy to port in characters from other d20 systems with only some minor conversions.
Stars Without Number: Revised Edition has amazing and easy to use resources for creating a universe full of adventure, and the stories that will keep both GMs and players coming back for more.
[5 of 5 Stars!]