Games like Space Simulation Toolkit on Steam
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Animal Revolt Battle Simulator
The ultimate physics-based, sandbox battle simulator where you can create funny battles between all sorts of ragdoll creatures! You can also make your own monsters with the unit creator or even join the battles yourself in the first-person mode!
Starship EVO
Create the Starship of your dreams, explore the vast expanse of the galaxy, land on planets and jump into epic space battles. Experience a truly unique and powerful building engine where your imagination is the limit. Welcome to the next evolution in Space Sandbox gaming!
Wayward Terran Frontier: Zero Falls
2d space combat like no other. From the perspective of a single crew member, explore the fully destructible interior of any ship in a massive living world. Engage in space combat with no hitpoints where you know your enemy is dead when you see them fall out of their ship into the cold dark of space.
When Ski Lifts Go Wrong
Ride into a hilarious construction puzzler; packed with over 100 creative physics-based challenges, sports and bloody disasters! Build contraptions to help every passenger reach their destination. Enjoy the sports by controlling your riders away from (or towards if you feel like it) peril!
Cine Tracer
Cine Tracer is a realistic cinematography simulator. The player operates real world based cameras, sets up lights, and directs talent/actors in stunning next gen environments created in Unreal Engine 4.
Evochron Mercenary
The life of an independent mercenary is rarely without excitement. Your spacecraft awaits and your adventure begins in the Sapphire star system.
Lunar Flight
A modern take on the classic arcade game, Lunar Lander, Lunar Flight extends the experience to a fully fictionalized and accessible lunar module simulator
Fun with Ragdolls: The Game
Become a ragdoll™ and create your own environments in Sandbox Mode, explore worlds created by others, or just flop around your destructible sets! Fun with Ragdolls®: The Game lets you enjoy everything you love about ragdolls!
Infinity: Battlescape
Infinity: Battlescape is a multiplayer space combat sim supporting hundreds of players on a single server. Join one of the corporate factions and fight for domination of a seamless, true-to-scale procedural star system. Participate in massive space and planetary battles involving hundreds of ships.
We Who Are About To Die
Fight & strategize your way through spectacles and arenas -- rise from lowly slave to Grand Champion and earn your freedom. Or... die trying. This Gladiator RPG Roguelite features in-depth career management and a unique physics simulated combat system. To those who are about to die, I salute you!
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.
Worlds Adrift Island Creator
Worlds Adrift is a Community-Crafted MMO: each and every island has been crafted by our playerbase. With the free Island Creator tool, this is your chance to create your own adventure for the community to experience. A crumbling ruin, or a teeming jungle, help expand the edges of Foundation ever further!
Master Of Pottery
Master of Pottery is a pottery-themed creation + simulation game. Make pottery, open exhibitions, complete orders, train apprentices, run your own showroom and start a relaxing pottery journey.
SuchArt: Creative Space
Paint on any surfaces with numerous tools in Creative Space — a free sandbox version of SuchArt: Genius Artist Simulator. Create masterpieces, complete commissions, and decorate your studio in the most advanced artist sim!
Reentry - A Space Flight Simulator
Do you have what it takes to be an astronaut? Reentry is a realistic space flight simulator based on NASAs space programs; from the first American human spaceflight in Project Mercury, the rendezvous and EVAs of Project Gemini to the Moon landing in Project Apollo.
Tiny Town VR
Create an original world and fill it with buildings, roads, vehicles and more. Give it life with posable characters. Tell a story with custom speech bubbles and in-game photo captures. Then, share with friends!
MachineCraft
The main purpose of this game is showing and watching machines made out of blocks. Some of the game-modes allow you to battle or race against other players. (testing phase) You can create your original machine with ease by reassembling those machines that are distributed, or by using the automatic control block.
Canvas The Gallery
Use spraypaint to paint whatever you want in a blank art gallery. Send your galleries to your friends for them to view your artwork.
Prismata
A perfect-information strategy game inspired by RTS, deckbuilders, and board games. Choose from three distinct technology classes and outwit your foes by snowballing your starting resources into a powerful cybernetic army. ABSOLUTELY NO PAY-TO-WIN.
Among Ripples
Control a pond's ecosystem; experiment with what you can do and see what happens. Among Ripples is a meditative ecosystem management simulator; you add different creatures to the pond and see how they interact.