Mindmeister is an easy to use tool for creating online mind mapping. Users are able to visualize, share and present their thoughts and ideas. Users can collect and insert different kinds of media, such as links, pictures or document files.
Mindmeister can be used for real-time collaboration, but also asynchronously. Furthermore, Mindmeister provides tools for coordinating task management and creating presentations.
The basic account is free and you can create up to three different online mind maps, but you have limited features comparing to the pro accounts. There are special rates for educational institutions.