Deco is an open source free IDE for React Native, it's fast and there's no manual setup needed.
It provides advanced drop component features. Controls are graphically editable through the property inspector.
Deco IDE used by more than 4000 developers world wide.
Right now Deco only supports on MAC only.
Here is video showing power of Deco - https://www.decoide.org/video.mp4
Platform support - OSX
Document - https://www.decoide.org/docs/getting-started
Showcase - https://www.decoide.org/showcase