Flask-Admin is advanced, extensible and simple to use administrative interface building extension for the Flask framework.
You're not limited by the default functionality - instead of providing simple scaffolding for the ORM models, Flask-Admin provides tools that can be used to build administrative interface of any complexity, using a consistent look and feel. Flask-Admin architecture is very flexible, there's no need to monkey-patch anything, every single aspect of the library can be customized.
Flask-Admin is evolving project, extensively tested and production ready.
Flask-Admin is extensively documented, you can find documentation here.
3rd Party Stuff
If you want to localize administrative interface, install Flask-BabelEx <https://pypi.python.org/pypi/Flask-BabelEx> package.
The library comes with a quite a few examples, you can find them in the examples <https://github.com/mrjoes/flask-admin/tree/master/examples directory.