Defold is a great commercial engine used to ship real games, but has its own license "derived" from Apache 2.0. You'll have to understand it before building on the engine.
Godot is a hobby engine with a standard MIT license, but with some major issues that make it unusable for any serious work. I worked with it for 3 months at the end of last year, but had to abandon the project after logging a few serious bugs in the issue tracker.
Godot is a hobby engine with a standard MIT license, but with some major issues that make it unusable for any serious work. I worked with it for 3 months at the end of last year, but had to abandon the project after logging a few serious bugs in the issue tracker.