is godot open source code example

Example 1: godot

Great Engine!

It's free, Open source, easy to learn and very powerful!
Try it out!

Example 2: godot

i recommend this, because it has the python programming language
and it's not an intricating engine.

But if you're coming from a unity background, don't worry, it has the c# language
(with some slight changes to the library)