Factory idle is described as 'Game to manufacture and collect and sell resources'. There are eight alternatives to Factory idle, not only websites but also apps for a variety of platforms, including Windows, Linux, Android, Mac and Steam. The best alternative is Mindustry, which is both free and Open Source. Other great sites and apps similar to Factory idle are Factorio (Paid), Dyson Sphere Program (Paid), Stationeers (Paid) and Factorio DrugLab (Free Personal).
Create elaborate supply chains of conveyor belts to feed ammo into your turrets, produce materials to use for building, and defend your structures from waves of enemies. Play with your friends in cross-platform multiplayer co-op games, or challenge them in team-based PvP matches.
Construct and manage your own space station and ships either by yourself in singleplayer or with friends online! Fully functioning atmospherics, science, power, engineering, medical, and agricultural systems.
Factorio DrugLab Factorio DrugLab is what you need to take the wide variety of plants and chemicals available and utilize them in industrial production of drugs and other products. In Factorio DrugLab you will set up advanced drug production.