Free Online Diagramming Software

draw.io is a free online diagram drawing application. You can use it to create UML, entity relationship, org charts, BPMN and BPM, database schema and networks. Also possible are telecommunication network, workflow, flowcharts, maps overlays and GIS, electronic circuit and social network diagrams. It's not meant as a full online Visio alternative, but you can perform most diagramming functions.

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