BuildBox is the world's first real sense of foolproof game making tool (founded by Trey Smith in 2014). Because in BuildBox, the entire game development process can be done simply by dragging and dropping operations, no coding, scripting, programming or software design experience required. It's specially developed for entrepreneurs, designers and other game creation enthusiasts without any program development foundation for game design.

As is known to all, all the time, the most popular RPG game production tool must have been none other than RPG Maker. But from now it needs to try its best to keep its job. Because it has had a brand-new and foolproof game engine that can produce both 2D and 3D RPG games with ease as its strong competitor - SMILE GAME BUILDER, which is currently the only 3D RPG game making software as I know (without regard to using the general 3D game development engines, such as Unity, Unreal Engine, etc.).

M.U.G.E.N (AKA: Mugen, MUGEN, 無限) is a discontinued but still very active free 2D fighting game engine with many customizable components. It was developed by Elecbyte, first released in 1999 (for DOS). In 2009, MUGEN 1.0 was released, and in 2013, MUGEN 1.1 came out.

Unity (AKA: Unity3D/Unity2D, U3D for short) is currently the most popular multi-platform free game engine developed by Unity Technologies from Denmark (mainly written in C, C++ and C#, and first released in 2005). Users with C# and JavaScript programming experience can get started more quickly.