draw.io - Online diagramming application
Modelio - Modelio is an open source modeling tool supporting natively UML, BPMN and model exchange with XMI.
Visio - Simplify and communicate complex information using data-linked diagrams.
Diagramo - Diagramo is an online flowchart software - diagrams (create, edit and share)
Bizagi Modeler - Business Process Modeling Software. Bizagi BPM software puts simplicity first.
UML Designer - UML Designer provides a set of common diagrams to work with UML 2.5 models.