Defnite is currently in very early stages, but is developing well. If you want to take part in the journey, visit it on itch.io.
The Game Creator Editor Extension is an extension for the Unity Editor, which features a window with all triggers, conditions and actions from Game Creator in the current scene, structured from A-Z, foldable and highlighted in the hierarchy when clicked on it.
For more extensions, look here.
I am making guides for Game Creator and its API. Learn more here.