Terrastruct : Terrastruct is a tool to create diagrams that excel at visually explaining complex systems, such as your organization's engineering architecture.
Azimutt : Azimutt is an Entity Relationship Diagram (ERD) targeting real world database schema (big & messy).
dbv.php : dbv.php is a database version control web application featuring schema management, revision scripts, and more!
PlantUML : PlantUML is an open-source tool allowing users to create UML diagrams from a plain text language
Flyway : You can think of Flyway as version control for your database. It lets you evolve your database schema easily and reliably across all your instances. F...
Infinite ASCII diagrams, save to Google Drive, resize, freeform draw, and export straight to text/html.