Gold Box – The RPG Series of 1990s
GoldBox is a Propriety Game Engine developed by SSI (Strategic Simulation Inc.) in 1988. This engine is written in C/C++ but its initial version was written in Assembly and PASCAL. It developed games for the platforms of Apple II, Apple Macintosh, Amiga, Commodore 64, Atari ST, DOS, NES, NEC PC-9800, and Sega Genesis.
Godot Game Engine
Godot is a cross platform free and open source game engine with MIT (a light license) licensing. It is written in C++ and C# and used to develop 2D and 3D games. The development environment runs on Windows, MacOS and Linux and develops games for platforms like windows, Linux, macOS, iOS, Android, HTML5, WebAssembly and Xbox One.
Gameplay3D Game Engine
Gameplay 3D is a Cross-platform game engine used to develop 2D and 3D games. Written in C++, this is used to develop games for Windows, Android, Linux, Blackberry, iOS and MacOSX. The game engine supports Visual Studio, Xcode, CMake, Qt Creator and Android NDK platforms to develop and build the platform.
G3D Innovation Engine- A Teaching Game Engine
G3D Innovation Engine is a fully featured, cross platform game engine. This is a 3D engine written in C/C++. It is a commercial-grade, open source engine for different platforms i.e. Windows, Linus and Mac OS. The engine is licensed under BSD-2 license and mainly used for teaching purpose.
Gambryo – A mature game engine
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Gambryo is a cross-platform game engine written in C++. It is a suit of several C++ libraries, plug-ins and run-time libraries. The engine supports several platforms like Windows, Android, Mac, Linux, iOS, Wii, Wii Ware, Xbox, Xbox 360, Xbox One, PS X, PS 2, PSP, PS3 and PS4.