Vertabelo is an online software development tool which provides an intuitive, visual editor for designing, managing and documenting relational databases. It enables developers to create and maintain complex database models without requiring any SQL knowledge. It supports both forward-engineering (generating SQL scripts from the model) and reverse-engineering (importing existing databases into the model). Vertabelo also includes a version control system, allowing users to share and collaborate on projects with others. It also provides a range of features for documenting databases, such as automatically generating entity-relationship diagrams and HTML documentation.
Very powerful tool, local only. Everything you need to create professional databases. Quite expensive. DeZign is part of a more complex and complete suite for db adminsitrator / architect. The interface is quite old, but it is easy to use anyway. If you are a database architect, deZign deserves an in-depth look for sure.