Mindmapper - Be more creative and get more done. Process your thoughts with a mind map and implement with a planner.
draw.io - Online diagramming application
Coggle - Coggle is a simple, beautiful, powerful way of structuring information.
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.
mind42 - Mind42 is a free online mind mapping software.
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.