When comparing Open ModelSphere vs DbSchema, the Slant community recommends DbSchema for most people. In the question“What are the best relational database design and modelling tools?” DbSchema is ranked 9th while Open ModelSphere is ranked 22nd. The most important reason people chose DbSchema is:
Includes the possibility to edit tables and data directly in the diagram without writing SQL statements.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Many features
Business process modeling, data modeling and UML modeling.
Pro Free version
Pro Graphical Diagram Editor
Includes the possibility to edit tables and data directly in the diagram without writing SQL statements.
Pro Multi-platform
Runs on Windows, Mac, and Linux.
Pro Virtual Foreign Keys
If the Database schema is missing real foreign keys, it is possible to create virtual ones to be used within the tool.
Pro Generator for Random Data
Includes the possibility to generate random numerical data or fetch random entries from a text file to populate the database.
Pro Generate schema from existing database
Includes the possibility to generate an ER diagram from an existing database.
Pro SQL editor with syntax highlighting
Includes an SQL editor with syntax highlighting and code completion feature.
Pro Graphical Query Editor
Includes a visual query editor capable of using different join types, filters as well as the 'group by' clause.
Cons
Con Not yet Windows-10 certified
And it looks like there is no recent development.