Visio - Simplify and communicate complex information using data-linked diagrams.
Diagramo - Diagramo is an online flowchart software - diagrams (create, edit and share)
draw.io - Online diagramming application
UML Designer - UML Designer provides a set of common diagrams to work with UML 2.5 models.
yEd - yEd is a free desktop application to quickly create, import, edit, and automatically arrange diagrams. It runs on Windows, Mac OS X, and Unix/Linux.
ARIS Express - ARIS Express is based on the proven ARIS methodology and industry standards.