"In recent years, a lot of mindmapping resources have begun popping up on the Internet. Some of the more powerful ones require you to download and install a chunky program on your computer. Others cost a pretty penny. Here are four free mindmapping tools that are web-based, meaning you can get up and running immediately without hassle.
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A simple and small downloadable Mindmapping programme with basic functions. Great for uncluttered mindmaps or students just learning to use them.
http://ictmagic.wikispaces.com/ICT+&+Web+Tools
"Mindmapping is a very serious and well researched subject, or art … or something . Whatever it is a map of the mind is definately something to be valued and this 'instructionalicious' guide is no exception. Allow this infographic to simultaneously blow and map your mind."
"A great, simple, collaborative mindmapping site. Invite other users to share ideas together in real time. It uses html which means that you can use it with most web enabled devices. Sign in using a Google account."
I've used many mind mapping tools and find them lacking in functionality (xmind) , expensive (inspiration) or very hard to use (Free Mind). Most of these tools will not allow you to have 2 main topics and create a double bubble map (like a venn diagram). Edraw Mind Map has a very easy to use ribbon interface similar to Word 2010 and tons of built in symbols and mind mapping templates. It is free for educational use and their site has tons of video tutorials that cover all the nifty features. It's the first mind mapping program where I felt like I wasn't fighting the interface.
"Organising information to find clarity is key for making good decisions. This collaborative mind-mapping tool allows multiple users to work together to put together their ideas and resources."
DebateGraph lets you explore and view individual debate and dialogue maps (and the graph of interrelated maps) through different types of bubble, box, tree and outline views that have complementary strengths, and that are accessed via the Views menu (above the map).
"Produce beautiful notes, quickly and easily. Share them with friends and colleagues to enhance your ideas collaboratively. All for free!"
Mindmapping tool