Make flowcharts, process diagrams, org charts, UML, ER and network diagrams
Draw.io (formerly Diagramly) is a free online diagram software. You can use it for making flowcharts, process diagrams, org charts, mind maps, wireframes, mockups, and network diagrams.
Its simple drag-and-drop interface is preloaded with all standard diagram shapes and connectors. You can save your work on Google Drive, Dropbox, OneDrive or your own device.
Completely free :)
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