MindMeister

MindMeister is an online mind mapping tool that lets you capture, develop and share ideas visually. More than 10 million people already use our award-winning mind map editor for brainstorming, note taking, project planning and tons of other creative tasks. MindMeister is completely web-based, which means there's no download and no updating! Whether you're working on Windows, Mac OS or Linux, you can always access your mind maps right inside the web-browser.