Games like Forging Master
Games like Forging Master include Space Engineers, 7 Days to Die, Kenshi, Factorio, and Satisfactory. We matched them by the tags players give Forging Master on Steam (Simulation, Open World, Base Building, Automation, and Physics): closest matches first, and among equally close ones the better-known games.

Space Engineers
Shared: Simulation · Open World · Building

7 Days to Die
Shared: Open World · Base Building · Survival

Kenshi
Shared: Open World · Simulation · Survival

Factorio
Shared: Base Building · Automation · Open World

Satisfactory
Shared: Base Building · Open World · Automation

Project Zomboid
Shared: Open World · Survival · Post-apocalyptic

Dyson Sphere Program
Shared: Automation · Base Building · Open World

Scrap Mechanic
Shared: Open World · Building · Physics

Stormworks: Build and Rescue
Shared: Open World · Base Building · Building

Schedule I
Shared: Simulation · Open World · Automation

The Last Caretaker
Shared: Base Building · Open World · Automation

Oxygen Not Included
Shared: Base Building · Building · Simulation

Once Human
Shared: Open World · Action · Survival

RimWorld
Shared: Base Building · Simulation · Survival

Sons Of The Forest
Shared: Open World · Base Building · Survival

State of Decay: YOSE
Shared: Open World · Base Building · Post-apocalyptic

Stationeers
Shared: Base Building · Automation · Physics

ARK: Survival Ascended
Shared: Open World · Base Building · Survival

Core Keeper
Shared: Open World · Survival · Base Building

Infection Free Zone
Shared: Base Building · Post-apocalyptic · Simulation

Hydroneer
Shared: Base Building · Automation · Open World

Raft
Shared: Open World · Survival · Base Building

Palworld
Shared: Open World · Survival · Base Building

DayZ
Shared: Open World · Survival · Post-apocalyptic