drawDB
Browser-based editor for database ER diagrams with SQL export
What it is
drawDB lets you lay out tables, columns, and relationships as an entity relationship diagram in the browser, then export the result as SQL for PostgreSQL, MySQL, MariaDB, SQLite, SQL Server, or Oracle. It can also import existing SQL scripts, generate migrations, and works without an account, storing diagrams locally. Developers and database designers use it to sketch and document schemas, and can run their own copy with Docker, optionally adding a sharing server.