Games like Garry's Mod on Steam
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Construction Simulator 2 US - Pocket Edition
The mobile hit Construction Simulator 2 is available on Steam! Experience one of the most comprehensive construction simulators for mobile devices, optimized for your PC.
Gang Beasts
Gang Beasts is a silly multiplayer party game with surly gelatinous characters, brutal slapstick fight sequences, and absurd hazardous environments, set in the mean streets of Beef City.
SimpleRockets
I am excited to release my first game on Steam! SimpleRockets was released in 2013 for mobile and I've put a ton of work into it to get it ready for PC and Mac. It was inspired by KSP, and it offers a simpler 2D experience for building rockets and exploring space with realistic orbital mechanics.
Occupy White Walls
A game about building art galleries may sound boring until you realise that just about anything can be an art gallery... Add in cutting edge AI, extremely creative community, Unreal graphics, and did we mention it's free?
Who's Your Daddy?!
Who's Your Daddy is a casual multiplayer game featuring a clueless father attempting to prevent his infant son from certain death. Play with up to 7 of your friends, and test your parenting skills in a competitive setup with wacky physics and over 69 potentially ominous household items.
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.
Skater XL - The Ultimate Skateboarding Game
Experience unparalleled board control and responsiveness while you skate iconic real-world skate spots. This is the evolution of skateboarding gameplay. With Independent Foot Control and unique physics-based gameplay, skate gamers finally have the expressive controls they have always dreamed of.
Tabletop Simulator
Tabletop Simulator is the only simulator where you can let your aggression out by flipping the table! There are no rules to follow: just you, a physics sandbox, and your friends. Make your own online board games or play the thousands of community created mods. Unlimited gaming possibilities!
Viscera Cleanup Detail
In Viscera Cleanup Detail, you step into the boots of a space-station janitor tasked with cleaning up after various horrific sci-fi horror events. Instead of machineguns and plasma-rifles, your tools are a mop and bucket. That hero left a mess, and it's up to you to deal with the aftermath.
Into The Flames
Into The Flames is a Solo/Co-op firefighting game that focuses on the intensity of being a real life firefighter. Drive emergency vehicles, bust down doors, fight raging fires, and do whatever it takes to bring the chaotic scene under control!
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!
BBQ Simulator: The Squad
Dive into a hilarious sandbox BBQ experience with friends! Grill, serve, and manage mayhem as meats soar and sizzle. Craft your grill, cook steaks, and feed everyone before hunger strikes!
Crazy Machines 3
Crazy Machines 3 is the latest, greatest, most amazing and craziest part of the series and fascinates once more with physic-based puzzles. Build your own crazy machines and share your awesomeness across the world thanks to the Steam® Workshop.
BeamNG.drive
A dynamic soft-body physics vehicle simulator capable of doing just about anything.
Poly Bridge 2
The acclaimed bridge-building indie-hit is back! More levels, more features, more physics fun!
Watermelon Game
A Casual Physics Puzzle game, where you have to combine matching Fruits to get Points and increase your Highscore. Play solo or measure your skills against another player online.
Regular Human Workshop
Regular Human Workshop is a 2D physics simulation sandbox. There are no predefined goals or objectives. Simply throw objects into the world and interact with them in various ways.
Tiny Life
In Tiny Life, you control a set of people that live together in a household. You take care of their daily needs, build their skills, forge new relationships... or just mess up their entire life in whatever way you can think of!
Just Die Already
Just Die Already is an old people mayhem sandbox game created by the designers of Goat Simulator. You are old and angry and you've just been kicked out of your retirement home. How will you survive in a world that wants you to Just Die Already?
Teardown
Prepare the perfect heist in this simulated and fully destructible voxel world. Tear down walls with vehicles or explosives to create shortcuts. Stack objects to reach higher. Use the environment to your advantage in the most creative way you can think of.
Cube Racer 2
A racing game with cubes on constantly changing tracks to mess with your friends in the fairest way possible
Train Station Renovation - First Job
Welcome to the prologue to Train Station Renovation. This is where you will learn and teach how to renovate these small and the largest train stations in the world.
Mutilate-a-Doll 2
A highly customizable virtual stressball and physics sandbox about mutilating ragdolls in various ways using an overwhelming amount of weapons and tools.