Kayuda is a free (ad supported) AJAX tool for mindmapping, brainstorming, and online writing.

What separates us from the other mindmapping tools? Several things:

• Link from any node to any node
• Name your links to show the nature of the relationship
• Store unlimited amounts of text and images inside your nodes
• Each user may have an unlimited number of workspaces, at no cost
• Multiple security levels are available for each workspace so that you can decide with whom and how you want to share your work.
• Did I mention it's free? (Well, ok, two small text ads in the bottom left corner)

People who might find Kayuda especially interesting:

• Mindmappers
• Graduate students trying to manage thesis notes and drafts
• Speakers trying to prepare for a speech
• Anyone preparing for a difficult conversation (e.g. "I deserve a raise") who wants to plan the different paths through the conversation