Godot (https://godotengine.org/) has given me the best mix of freedom and helpfulness. I worked in Unity for a few years, which was terrible but popular, and have done a small amount of Unreal Engine work, and have found them to be more "enterprise"-y than I need/want. Godot is FOSS and is a really incredible community. GDScript is pretty cool (if you're familiar or enjoy Python it'll feel pretty normal), but you can use pretty much whatever programming language you like.