Free database modeling tool, can generate models or diagrams from scratch, ready for further customization.
Supports several image formats for saving, and can also save as PDF.
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Pro Complete diagrams
Generates complete diagrams of a database with one click.
Only a 5 Mb download.
Pro Multiple databases
Supports multiple databases: Oracle, SQL Server, PostgreSQL, MySQL, Azure, Amazon Redshift, SQLite and Firebird.
Very user friendly.