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.
DBeaver - DBeaver - Universal Database Manager and SQL Client.
draw.io - Online diagramming application
DataGrip - Tool for SQL and databases
Visio - Simplify and communicate complex information using data-linked diagrams.
HeidiSQL - HeidiSQL is a powerful and easy client for MySQL, MariaDB, Microsoft SQL Server and PostgreSQL. Open source and entirely free to use.