Unity did open the pandora box, to some extend of course. In the realm of c++ abominations, you also have the star citizen 3D engine. But if you don't need 3D

Unity did open the pandora box, to some extend of course. In the realm of c++ abominations, you also have the star citizen 3D engine. But if you don't need 3D, you better off using a 2D GFX toolkit and just be careful with the OS interfaces usages. Look at nuklear 2D GFX, everything in one C/c++ header file, and I bet it does a good enough job for already tons of apps.