LDtk (short for Level Designer toolkit, formerly called LEd) is a free and open-source 2D level editor for Windows, Mac and Linux platforms, developed by deepnight (Sébastien Bénard) from France, who are the former director of the well-known indie game Dead Cells, with 20+ years of experience for creating various games.

Stunt Rally is a completely free and open-source 3D racing game for Windows and Linux platforms. It uses several open-source technologies (such as driving simulator VDrift, physics engine Bullet, object-oriented graphics rendering engine OGRE, grid's rendering optimization PagedGeometry, fast, flexible and simple GUI MyGUI, etc.) to construct a very complex and interesting auto stunt rally game.

Grome (short for Ground Moeling Environment) is a 3D simulation software for game environment that was especially designed for game developers, developed by Quad Software from Romania in 2007. However, its applications are not limited to entertainment industry. More than a terrain editor/level editor, it is also a complete scene constructor. In fact, it was also successfully used in some other cases, for example: virtual reality projects, real-time 3D simulation, the creation of scenes for offline rendering, and more.

Hello Mario Engine (formerly called Hello's Mario Engine, Hello Engine) is a feature-packed, fully-documented, easy-to-use Super Mario game engine for GameMaker: Studio, developed by Hello Fangaming from MFGG (Mario Fan Games Galaxy) in 2007. It enables anyone to make a Mario game with ease. Even better, it's free and open-source (under the new BSD License), which means you can make whatever you want with this engine, without any restrictions.

Mario Editor is the latest, free Mario game platformer/level editor created by Hello Fangaming in 2016, using the GameMaker: Studio game engine. Meanwhile, it's also the successor of the Super Mario Bros: Game Master, and serves as the celebration of the 10th anniversary of the famous and popular open-source project: Hello Mario Engine.