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.
MySQL Workbench - MySQL Workbench is a unified visual tool for database architects, developers, and DBAs.
OmniGraffle - OmniGraffle is for creating precise graphics like website wireframes, an electrical system designs, or mapping out software class.
DBeaver - DBeaver - Universal Database Manager and SQL Client.
draw.io - Online diagramming application
Vertabelo - Online tool for visual database design.