Definitely Astronat RPGs/Settings
- Apollo 47
- Holdfast Station
- Jovian Despair
- NULL_SPACE
- Orbital 2100 (a setting for Traveller/Cepheus Engine)
- Orbital Cold War (a setting for Cepheus Engine)
- Outpost Mars (a setting for Cepheus Engine)
- Pioneer (upcoming astronaut RPG by the people making Traveller)
- Sixty Years in Space
- Void Above
Can be used for Astronaut Missions
- cramOS. Robotic RPG, which could fit playing as a group of rovers (like the Curiosity/Perseverance Mars rovers) or robotic astronauts (like NASA’s Robonaut)
- Eclipse Phase, specifically a Reclaimers salvage/orbital debris cleanup campaign.
- GURPS Transhuman Space. The rest of the solar system is ripe for astronaut missions.
- HARDCASE. Near-future gig economy on a space station. Salvage jobs (like the Maria Seraph) help this game somewhat appropriate for astronaut missions.
- Jovian Chronicles. A hard sci-fi mech game in our own solar system. A campaign about Explorers, Spacers, and Technicians (rather than the mechs) using a Gritty or Adventurous Reality-Distortion level fits astronaut perfectly.
- Mothership. A game about the stress and horror of working in outer-space. A mission for Teamsters and Scientists would work perfectly as an astronaut mission - just hold the spooky crab monster on the side.
- Mutant Year Zero. Specifically via the Ad Astra expansion/campaign setting, which is all about survival and discovery in our mutated solar system.
- Orbiters Local 519. A game of salvaging space derelicts. Can work well for a darker, dangerous reimagining of Planetes-style space garbage collection.
- Shadows Over Sol. Mostly space-horror, but frequently goes all-in on astronaut missions.