Cacoo is a Level 3 graphic organizer/mindmapping tool. Drag-and-drop shapes, change colors, connectors and relationships to create fantastically detailed organizers and flowcharts. A free account is required to create with some limits, but the free version is more than enough for what you and your students will need.
Be sure to scroll down to access all available training resources.
Download this printable QuickStart guide for yourself and your students.
Ready to get your mindmapping on? Follow this link to start your students rockin' Cacoo in the classroom!