Overview
Stars Without Number is a sandbox science fiction tabletop role-playing game designed by Kevin Crawford and published by Sine Nomine Publishing. Originally released in 2010, followed by an extensively expanded and restructured Revised Edition in 2017, the game is a prominent fixture of the
Old School Renaissance (OSR) 
https://groupfinder.eu/library/old-school-renaissance-osr-2000 movement. It is structurally engineered to merge the lightweight tactical framework of early fantasy role-playing systems with exhaustive, modular sci-fi sandbox generation toolkits.
Description
Stars Without Number takes place in the year 3200, centuries after the tragic collapse of the Second Terran Mandate. The human galaxy was once interconnected by instantaneous jump gates and protected by a core of psychic navigators, until an evolutionary psychic catastrophe known as "The Scream" drove every psychic in existence instantly insane or dead. The sudden collapse of interstellar transit triggered a multi-century dark age of isolation known as the Silence. In the modern setting, fractured sectors of space are finally rediscovering faster-than-light spike drives and exploring a fragmented universe. Players navigate this dangerous frontier as spacers, scavengers, mercenaries, or rogue psychics, operating in a cosmos characterized by corporate espionage, lost pre-collapse technology, and shifting planetary regimes.
Links
sinenomine-pub.com https://sinenomine-pub.com - Official homepage for Sine Nomine Publishing and Kevin Crawford's developer catalog
drivethrurpg.com https://www.drivethrurpg.com/en/product/230009/stars-without-number-revised-edition-free-version - Revised Edition (Free Version) on Drive Thru RPG