What are some alternatives?
When comparing OpenSceneGraph and Unreal Engine, you can also consider the following products
irrlicht - This caused the Irrlicht homepage and forum to work badly. Over the last days most things started working again – except the forum continues to be broken. Old posts can be read but everything else is currently not working.
Unity - The multiplatform game creation tools for everyone.
OpenGL - OpenGL is the premier environment for developing portable, interactive 2D and 3D graphics...
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
Vulkan - Vulkan is a new generation graphics and compute API that provides high-efficiency, cross-platform access to modern GPUs used in a wide variety of devices from PCs and consoles to mobile phones and embedded platforms.
GDevelop - GDevelop is an open-source game making software designed to be used by everyone.