DBeaver - DBeaver - Universal Database Manager and SQL Client.
draw.io - Online diagramming application
DbVisualizer - DbVisualizer is the universal database tool for developers, DBAs and analysts.
LucidChart - LucidChart is the missing link in online productivity suites. LucidChart allows users to create, collaborate on, and publish attractive flowcharts and other diagrams from a web browser.
phpMyAdmin - phpMyAdmin is a tool written in PHP intended to handle the administration of MySQL over the Web.
PlantUML - PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams.