Apps similar to OpenSceneGraph include OGRE, which is free and open source. Other options are HARFANG 3D, Pygame, irrlicht and Lumix Engine. In total there are eight Game Development Tools like OpenSceneGraph for Windows, Linux, Mac, the web and Android.
OGRE (Object-Oriented Graphics Rendering Engine) is a scene-oriented, flexible 3D engine written in C++ designed to make it easier and more intuitive for developers to produce applications utilizing hardware-accelerated 3D graphics.
HARFANG®3D is a cross-platform & multi-language solution to integrate with embedded systems, existing environments & combining features to meet the industrial standards of 3D imaging.
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Pygame is a set of Python modules designed for writing video games. Pygame adds functionality on top of the excellent SDL library. This allows you to create fully featured games and multimedia programs in the python language.
The Irrlicht Engine is an open source high performance realtime 3D engine written in C++. It is completely cross-platform, using D3D, OpenGL and its own software renderers, and has all of the state-of-the-art features which can be found in commercial 3d engines.
Lumix Engine is an open-source 3D game design software and engine. It's written in C++ and supports several scripting languages.
two is an all-purpose c++ app prototyping library, focused towards live graphical apps and games.
The Forge is a cross-platform rendering framework PC, Linux, Ray Tracing, macOS / iOS, Android, XBOX, PS4, Switch and Stadia. Particularly, the graphics layer of The Forge supports cross-platform descriptor management, multi-threaded and asynchronous resource loading, shader...
MOS is a lightweight cross platform game engine/library, written in modern C++. Some of the included functionality is: 3D mesh rendering, physically based material model, global illumination, particle rendering, text rendering, collision detection, 3D audio playback and asset...
