Games like Frontier Forge
Games like Frontier Forge include Planet Coaster, Crusader Kings III, Foundation, Game Dev Tycoon, and Mount & Blade II: Bannerlord. We matched them by the tags players give Frontier Forge on Steam (Simulation, Economy, Medieval, Automation, and Management): closest matches first, and among equally close ones the better-known games.

Planet Coaster
Shared: Simulation · Management · Economy

Crusader Kings III
Shared: Medieval · Simulation · Management

Foundation
Shared: Simulation · Medieval · Management

Game Dev Tycoon
Shared: Simulation · Management · Economy

Mount & Blade II: Bannerlord
Shared: Medieval · Simulation · Strategy

Supermarket Simulator
Shared: Simulation · Economy · Management

Parcel Simulator
Shared: Simulation · Automation · Management

TCG Card Shop Simulator
Shared: Simulation · Economy · Management

Schedule I
Shared: Simulation · Management · Automation

Big Ambitions
Shared: Economy · Simulation · Management

Internet Cafe Simulator 2
Shared: Simulation · Management · 3D

Farming Simulator 25
Shared: Simulation · Economy · 3D

Cities: Skylines
Shared: Simulation · Management · Economy

Tavern Master
Shared: Simulation · Management · Medieval

Captain of Industry
Shared: Simulation · Automation · Economy

Cities: Skylines II
Shared: Simulation · Economy · Management

Potion Craft: Alchemist Simulator
Shared: Simulation · Medieval · Management

The Guild 3
Shared: Economy · Simulation · Medieval

Euro Truck Simulator 2
Shared: Simulation · Economy · Management

Startup Company
Shared: Simulation · Economy · Management

Retro Rewind - Video Store Simulator
Shared: Simulation · Management · Economy

House Flipper
Shared: Simulation · Action · Relaxing

SAELIG
Shared: Simulation · Economy · Medieval

Banished
Shared: Simulation · Medieval · Strategy

