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.
ClanLib is a multi-platform game toolkit written completely in C++. It supports Microsoft Windows, macOS, and Linux, with limited support for mobile platforms. ClanLib comes with full hardware-accelerated graphics support through OpenGL allowing developers to use the hardware capacity to the maximum in graphics rendering for game objects, and also a software renderer.