Games like Planet Forge
Games like Planet Forge include Elite Dangerous, Euro Truck Simulator 2, X4: Foundations, No Man's Sky, and Universe Sandbox. We matched them by the tags players give Planet Forge on Steam (Exploration, Immersive Sim, Space, Simulation, and Space Sim): closest matches first, and among equally close ones the better-known games.
Elite Dangerous
Shared: Space · Exploration · Space Sim
Euro Truck Simulator 2
Shared: Simulation · Exploration · Open World
X4: Foundations
Shared: Space · Simulation · Exploration
No Man's Sky
Shared: Space · Exploration · Open World
Universe Sandbox
Shared: Simulation · Space · Space Sim
Police Simulator: Patrol Officers
Shared: Simulation · Immersive Sim · Open World
Empyrion - Galactic Survival
Shared: Simulation · Space · Exploration
Kerbal Space Program 2
Shared: Exploration · Space · Simulation
SnowRunner
Shared: Simulation · Exploration · Open World
SPORE™
Shared: Exploration · God Game · Simulation
Starfield
Shared: Space · Exploration · Open World
Avorion
Shared: Exploration · Space · Space Sim
American Truck Simulator
Shared: Simulation · Exploration · Open World
Kerbal Space Program
Shared: Space · Simulation · Space Sim
Internet Cafe Simulator 2
Shared: Exploration · Simulation · 3D
Seafarer: The Ship Sim
Shared: Simulation · Exploration · Immersive Sim
Ultimate Fishing Simulator
Shared: Simulation · Immersive Sim · 3D
Spaceflight Simulator
Shared: Space · Space Sim · Exploration
Finnish Cottage Simulator
Shared: Simulation · 3D · Exploration
WolfQuest: Anniversary Edition
Shared: Exploration · Life Sim · Immersive Sim
Reentry - A Space Flight Simulator
Shared: Space · Simulation · Space Sim
ASTRONEER
Shared: Space · Exploration · Open World
Forza Horizon 6
Shared: Exploration · Simulation · Open World
Farming Simulator 25
Shared: Simulation · 3D · Immersive Sim