XMind

Whether it's a formal meeting presentation, or just a quick brainstorming session, XMind's award-winning open-source software provides a quick and easy way to share your ideas. Double-click to create and edit topics anywhere on a map, or drag-and-drop for reorganizing topics, moving markers, taking a mapshot, and adding attachments. You can even search topics with Google and drag images into your map without leaving the working window. XMind also lets you manage tasks, export to popular formats such as PDF, Word and PowerPoint, or embed a mind map viewer into a blog to enable more people to see your ideas.