RPG Maker (AKA: RPG Tsukūru, RPGツクール, RPG Tkool) is the most popular 2D RPG games development engine developed by Enterbrain company from Japan. It's both simple enough for a child and powerful enough for a developer. The whole series mainly includes: RPG Maker 2000, RPG Maker 2003, RPG Maker XP, RPG Maker VX, RPG Maker VX Ace, and RPG Maker MV.

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.

Unreal Engine (UE for short) is currently the most famous and widely authorized top 2D/3D multi-platform universal game engine for Windows and Mac OS X (written in C++) in the world, which has occupied 80% of the market share of the global commercial game engines. The great games developed based on it are numerous, including Unreal Tournament, Gears Of War, Mass Effect, BioShock, Borderlands, Mirror's Edge, and many other series of big game works.

Spriter is a popular sprite character creating tool for 2D game animation, which comes with powerful functions, friendly UI and simple operation. By means of the modular animation technology (to complete the integration of animation modules through assembly), it enables everybody (whether he or she has the experience of making animation or not) to be able to quickly and easily create exquisite, professional and well-worked sprite characters for 2D game animation.

MultiHero is an old fan-made, fast-paced 2D multiplayer fighting game developed in 2006. It's primarily inspired from the classic video game work Super Smash Brothers.