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First Post
SWN is a white box type retroclone. It does have great world/system/faction generation rules but I would hesitate to say it is an alien packed sci-fantasyStarfinder is only slightly less crunchy than Pathfinder, and they add in all the chase and starship rules on top, so you really don't get out of rules overload.
However, it's my favorite system right now, mainly because it IS fairly compatible with PF and other d20 systems.
If you want a chunky, yet rules light Sci-Fi game (and one that is similar to D&D), check out Stars Without Number: Revised. So much winning!