There was a need to work with the MS SQL database, but I did not want to install and understand the complex SQL Management Studio program, and this product turned out to be very easy to install and use. For more then 2 month i've used the tool haven't came across any issues.
DBeaver - DBeaver - Universal Database Manager and SQL Client.
Diagramo - Diagramo is an online flowchart software - diagrams (create, edit and share)
MySQL Workbench - MySQL Workbench is a unified visual tool for database architects, developers, and DBAs.
Modelio - Modelio is an open source modeling tool supporting natively UML, BPMN and model exchange with XMI.
DataGrip - Tool for SQL and databases
UML Designer - UML Designer provides a set of common diagrams to work with UML 2.5 models.