In the wake of the Godot situation, I am here to recommend alternatives. Not all of these are engines. Some of them are frameworks, but all of these are FOSS and general purpose.
2D:
* SDL - https://www.libsdl.org/
* SFML - http://www.sfml-dev.org/
* Allegro - http://liballeg.org/
* Gosu - https://www.libgosu.org/
* Love2D - https://love2d.org/
* Pygame- https://www.pygame.org/
* FreeBASIC - https://www.freebasic.net/
* raylib - http://www.raylib.com/
3D:
* Irrlicht Engine - https://irrlicht.sourceforge.io/
* OGRE - https://www.ogre3d.org/
* ioquake3 - https://ioquake3.org/
* Panda3D - https://www.panda3d.org/
Both:
* MonoGame - https://monogame.net
* GDevelop - https://gdevelop.io/
* jMonkeyEngine - https://jmonkeyengine.org/
* Lightweight Java Game Library - http://lwjgl.org/
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