Games like Osta
Games like Osta include Arma 3, Hearts of Iron IV, Garry's Mod, UBOAT, and House Flipper. We matched them by the tags players give Osta on Steam (Simulation, Casual, Sandbox, Military, and Immersive Sim): closest matches first, and among equally close ones the better-known games.
Arma 3
Shared: Military · Simulation · First-Person
Hearts of Iron IV
Shared: World War II · Military · Simulation
Garry's Mod
Shared: Sandbox · Casual · Simulation
UBOAT
Shared: Simulation · World War II · Military
House Flipper
Shared: Simulation · Sandbox · Casual
PC Building Simulator
Shared: Simulation · Immersive Sim · Sandbox
PowerWash Simulator
Shared: Casual · Simulation · Sandbox
IRON NEST: Heavy Turret Simulator
Shared: Simulation · Military · War
Ravenfield
Shared: Military · Sandbox · War
Totally Accurate Battle Simulator
Shared: Simulation · Sandbox · War
Kenshi
Shared: Sandbox · Simulation · Immersive Sim
Easy Red 2
Shared: Sandbox · World War II · Military
Total Tank Simulator
Shared: Simulation · Sandbox · World War II
Arma Reforger
Shared: Simulation · Military · Sandbox
Goat Simulator
Shared: Simulation · Sandbox · Casual
Squad 44
Shared: Simulation · World War II · Military
Stardew Valley
Shared: Simulation · Sandbox · Casual
Foxhole
Shared: Military · Sandbox · World War II
Streamer Life Simulator 2
Shared: Simulation · Immersive Sim · Casual
Bomber Crew
Shared: Simulation · World War II · War
Potion Craft: Alchemist Simulator
Shared: Simulation · Crafting · Sandbox
Slime Rancher
Shared: Simulation · Sandbox · Casual
Battlefield™ V
Shared: World War II · Military · War
My Time at Portia
Shared: Simulation · Casual · Crafting