https://godotengine.org/
https://o3de.org/
https://defold.com/
https://www.stride3d.net/
https://gdevelop.io/
https://armory3d.org/
https://torque3d.org/engine/
https://flaxengine.com/
https://pragma-engine.com/
https://wickedengine.net/
https://www.adventuregamestudio.co.uk/
https://castle-engine.io/
https://solarus-games.org/