MyRPG Master

"MyRPG Master is a game creation tool, featuring multiple editors for designing 3D environments, sculpting terrains, and creating game rules and storylines. The World Editor lets you place 3D objects, precipitations, lights, sounds, and particles, while the Terrain Editor offers 10 tools to adjust the shape of your world. With GUI, Rules, and Universe editors included, MyRPG Master empowers users to craft playable solo or multiplayer RPG adventures."