The Torque Game Engine is a great platform to create games upon.
Argan Game Engine is a development platform for games.
It provides an entire platform on which simulation products can be built.
Ice2D™ Game Engine targets commercial game development .
Developed with an emphasis on the importance of the 3D rendering technologies.
Create and destroy planets, solar systems, galaxies, or even galaxy clusters.
Keen Software House
Experience a full sandbox environment to construct and explore.
Craft your world in pixel blocks with The Sandbox.
Change variables used in a windowed game by scanning its memory.
Flash Burn Studio
Engineering - Mystery of the ancient clock is a match-3 game.
It includes tools for designing and running "point and click" adventure games.
It is a sandbox game and a game engine inspired by Minecraft.
Garry's Mod is a Sandbox Game based around the idea of building.
Rogue Survivor is a free zombie survival roguelike sandbox game.
2D sandbox game with a lighthearted mood, colorful art and RPG elements.
Solar 2 is an open-world, sandbox game set in an infinite abstract universe.
Unreal Construction is basically a sandbox game mode.
Note Block Studio is a music editor for the popular sandbox game Minecraft.
Eric Hartman, Ben Garney, Anthony Rotondo
Blockland is a non-linear sandbox game with no set goals.
Little Alchemy is an addictive sandbox game for Windows users.
MyDream Interactive, Inc.
MyDream is an online multiplayer sandbox game for Windows.