draw.io - Online diagramming application
Mindmapper - Be more creative and get more done. Process your thoughts with a mind map and implement with a planner.
LucidChart - LucidChart is the missing link in online productivity suites. LucidChart allows users to create, collaborate on, and publish attractive flowcharts and other diagrams from a web browser.
Quest Software - Simplify IT management and spend less time on IT administration and more time on IT innovation. It’s time to rethink systems and information management.
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.
SAP PowerDesigner - SAP PowerDesigner: Enterprise Architecture tools for digital transformation success