Games like Besiege on Steam
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SimplePlanes
Build airplanes by snapping parts together, designing wing sections, and attaching engines. At any time, you can strap yourself into the cockpit and see how it flies with realistic physics. If you're not in the mood for building, over 100,000 airplanes are available to download for free.
Ancient Warfare 3
Dive into a sandbox full of action and customization! Choose from different game modes like deathmatch, conquest, king of the hill, zombie survival and many more. Create your own scenarios and content in the easy to use in-game editors or use one of the 50k+ workshop items from other players...
Trainz Railroad Simulator 2022
Drive, Explore, Operate and Create the railroad of your dreams - and now you can collaborate in real time with Multiplayer Surveyor! TRS22 showcases a range of high quality routes, sessions and trains to drive, plus all the scenery you need to make your own masterpiece.
Totally Accurate Battle Simulator
Be the leader of wobblers from ancient lands, spooky places, and fantasy worlds. Watch them fight in simulations made with the wobbliest physics system ever created, make your own wobblers in the unit creator and send your army off to fight your friends in multiplayer.
OpenTTD
OpenTTD is a business simulation game in which players earn money by transporting passengers and cargo via road, rail, water, and air. It is an open-source remake and expansion of the 1995 Chris Sawyer video game Transport Tycoon Deluxe.
Learn to Fly 3
Build your spaceship from scratch, earn funds and invest them into building a bigger, better spaceship as you try and fly your way up to space!
Space Simulation Toolkit
Physics sandbox game that uses a graphics card as a supercomputer. Change the laws of physics, design mechanisms, create A-Life worlds and inhabit them with living beings, experiment with evolution and AI.
Tracks - The Train Set Game
Jump into the ultimate toy sandbox and build the train set of your dreams! Create colourful railway systems, decorate beautiful towns, transport commuting passengers, and even ride your train in first-person.
Shieldwall
Shieldwall is a funny third-person tactical battle simulator with strategy elements. It allows you to feel like a squad leader right on the battlefield.
Galimulator
Galimulator is a galactic empire simulation and sandbox game. See how Empires rise and fall, and how the people in them climb through the ranks to bring prestige to their Dynasty. Then throw in an invasion of self replicating Smatter monsters if you want to spice things up.
Bridge Constructor
Become an appraised bridge engineer and architect in Bridge Constructor. Create and design your own constructions and watch the cars and trucks pass over them - or see them fall and crash while your inferior creations collapse due to weight and the laws of physics!
Scrap Mechanic
Enter the creative paradise of Scrap Mechanic! Build fantastic machines, go on adventures with your friends and defend against waves of evil Farmbots in this imaginative multiplayer survival sandbox. With Scrap Mechanic’s powerful creation tools you can engineer your own adventures!
Kill It With Fire: Ignition
Kill It With Fire: IGNITION is a free sampler of a first-person action game about hunting spiders and causing collateral damage. The full game is OUT NOW!
Diesel Railcar Simulator
Drive vintage diesel trains, shifting gears manually and trying to reach a perfect score. Create new routes, trains and timetables. Share your creations and download new content from the Workshop.
Planet Coaster
Planet Coaster® - the future of coaster park simulation games has arrived! Surprise, delight and thrill incredible crowds as you build your coaster park empire - let your imagination run wild, and share your success with the world.
SimCasino
Modern Casino Tycoon Simulation in full 3D glory. Build the casino. Set the odds. Expand into a luxury hotel/casino or go cheap & extract max profits. Keep the vault secure at all times, and beware of criminals & cheaters!!
Rover Mechanic Simulator
As an Engineer - crew member of one of the first Mars colonies - you are responsible for repairing and maintaining Mars Rovers. In this advanced simulator you will learn the internal details of various Mars Rovers and their components.
Planet Coaster 2
Build and customise thrilling roller coasters and incredible water slides, manage the ultimate theme park experience, and share your epic creations. Are you ready to ride the wave?
Potion Tycoon
Potion Tycoon is a management simulator with a witchy twist! Build and develop your very own magic shop. Manage resources, set up production lines, mix potions and sell them smartly to stay ahead of the competition. Welcome to the potion business!
Rolling Line
Build your own model railway tracks and scenery or explore pre-made layouts, including 1000s of player-made layouts and mods on the Steam Workshop! Play in virtual reality and on PC!
Planet Zoo
Build a world for wildlife in Planet Zoo. From the developers of Planet Coaster and Zoo Tycoon comes the ultimate zoo sim. Construct detailed habitats, manage your zoo, and meet authentic living animals who think, feel and explore the world you create around them.
Foundation
Foundation is a grid-less, laidback medieval city-building game with a focus on organic development, monument construction and resource management.
Goat Simulator 3
Pilgor's baaack! Gather your herd and venture forth into Goat Simulator 3; an all-new (at least on Steam), totally realistic, sandbox farmyard experience. Invite up to three friends in local or online co-op, create carnage as a team, or compete in mini-games and then not be friends anymore.
RealFlight Evolution
RealFlight® is the industry-leading flight simulator for radio-controlled airplanes, helicopters, and drones. Fly more than 300 hyper-realistic vehicles in an immense, open world right from your desktop. This RC classic is a must-have tool for flight enthusiasts of all skill levels!