Adventure Game Studio (AGS) is an open source adventure game studio.

Cocos2d-x is an open-source and cross platform open source free 2D game engine for mobile game development known for its speed, stability, and easy of use.

LateralGM (LGM) is an alternate Game Maker IDE founded by IsmAvatar that is compatible with both ENIGMA and Game Maker.

Godot is an advanced, feature-packed, multi-platform 2D and 3D open source game engine.

RPG Maker (RPG Tkool) is a series of programs for the development of role-playing games (RPGs).

Torque Game Engine, or TGE, is a 3D computer game engine.

Blitz3D is a classic game programming language for PC.

CryEngine is a game engine with the initial version being used in Far Cry, and continues to be updated to support new consoles and hardware for their games.

GDevelop is an open source game creation software.

Playir is a mobile app and game creation platform, that allows you to create your own games and apps from pre-made templates.

Scratch is a free programming language and online community where you can create your own interactive stories, games, and animations.

Unity is a cross-platform game engine developed by Unity Technologies.