SpiderScribe is an online mind mapping and brainstorming tool. It lets you organize your ideas by connecting notes, files, calendar events, etc. in free-form maps. You can collaborate and share those maps online!
How to Make a Popplet, a Collaborative Mind Mapping Tool
Mind Mapping Tools for Classrooms. Is there a particular subject or type of tool that you are seeking? By request, here are several teacher-recommended mind mapping tools for the classroom. Build mind maps in advance, or use these tools live during your instruction for a more interactive classroom experience. Photo by: https://www.flickr.com/photos/eepaul/7008085799/