Semanta Modeler
Get yourself a free database modeling tool!
Semanta Modeler is a free semantic modeling tool. It has proven it's value for years, and is primarily aimed at database modelers. It gives you a professional semantic modeling tool, which generates scripts for multiple relational database types (e.g. Oracle, Microsoft SQL server, ...).
Semanta Modeler is provided, free of charge, by COAS Software Systems B.V.
Hit one of the buttons below to download Semanta Modeler. You can choose to download either the stable version (which is recommended), or a test (preview) version (which gives you a preview on upcoming changes).
Any issues can be reported via the issue tracker on GitHub.
When running on Windows 10 or higher, you can also get Semanta Modeler from the Microsoft store