LucidChart - Collaborative Diagramming
LucidChart is a web-based, collaborative flowcharting and diagramming application. It can be used at all levels of education to create flowcharts, network diagrams, UML diagrams, mind maps, graphic organizers and much more. In addition, it is ideal for group projects since multiple students can access the document and make changes simultaneously, with changes merged and synced immediately.
Free educational accounts can be requested.