DbSchema - DbSchema - Visual Database Design & Management Tool
Diagramo - Diagramo is an online flowchart software - diagrams (create, edit and share)
SAP PowerDesigner - SAP PowerDesigner: Enterprise Architecture tools for digital transformation success
Modelio - Modelio is an open source modeling tool supporting natively UML, BPMN and model exchange with XMI.
pgModeler - Open source data modeling tool designed for PostgreSQL. No more DDL commands written by hand. Let pgModeler do the job for you!
UML Designer - UML Designer provides a set of common diagrams to work with UML 2.5 models.