Tool · Web and desktop app
draw.io
draw.io · drawio.com Free Beginner
The free, open-source diagram editor (also known as diagrams.net): free forever, no sign-up, and your files stay wherever you save them. It has shape libraries for flowcharts, org charts, network, cloud, UML and ER diagrams.
- Use the desktop app if diagrams must stay on your machine.
- Anyone can open and edit a draw.io file, so there is no licence to buy for collaborators.