Godot Engine
Used by 2 peoplegodotengine.org ↗

“On the software-side, these days I'm working in Godot and I'm very happy with it.”
Michael Brough Interview, Game developer, potion brewer · via Uses This 
“It's great but I would also like to learn Godot Engine as an open source alternative that's a bit more accessible.”
Mars Buttfield-Addison Interview, Developer, PhD candidate · via Uses This