Some time ago I mentioned the Core Data Editor tool that provides a nice interface for looking through and editing your Core Data databases with nice code generation features.
The Core Data Editor has improved considerably since first mentioned and now has now been open sourced by developer Christian Kienle as he can no longer maintain the project.
Here’s an image showing the browsing capabilities of the Core Data Editor:
You can find the Core-Data-Editor source code on Github here.
A great tool now open source.