draw.io is the most powerful diagramming add-on for Confluence. It allows you to create and collaboratively develop graphs and diagrams of any kind, directly within Confluence pages: flow charts, network diagrams, organization charts, UML diagrams, mind maps and more. A second, mature add-on with similar features is Gliffy.
For customers who wish to upgrade from Gliffy to draw.io, or who want to run both add-ons temporarily or permanently, draw.io comes with a practical feature: Gliffy mass import for draw.io Server. All diagrams created with Gliffy can be quickly and easily imported into draw.io, and edited as if they were native draw.io diagrams.