DB Designer - fabFORCE.net Database Tools
Diagramo - Diagramo is an online flowchart software - diagrams (create, edit and share)
Vertabelo - Online tool for visual database design.
Modelio - Modelio is an open source modeling tool supporting natively UML, BPMN and model exchange with XMI.
Dataedo - Database documentation tool
UML Designer - UML Designer provides a set of common diagrams to work with UML 2.5 models.