SpiderScribe

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, with other teachers or your students. There is a video on the website which shows you exactly how Spiderscribe works - I've also posted it below for you to look at.

The good thing about Spiderscribe is that it's free to use, or you can choose to pay for an upgraded account.  You can see an example of a map that someone has created about Cognitivism here for you to get some ideas on how to use this great tool.