Lucidchart is a nice tool for creating flowcharts, mindmaps, and graphic organizers. Lucidchart offers a simple drag and drop interface for creating flow charts, organizational charts, mind maps, and other types of diagrams. Google Chrome users can now use Lucidchart offline through the Lucidchart Chrome app.
Applications for Education
Lucidchart charges business customers, but makes all of their tools free for teachers and students. Watch the video below for an example of Lucidchart educational templates.