MindNode (free)

From Markus Mueller:

MindNode is an elegant and simple-to-use mindmapping application for collecting, organizing and outlining your thoughts and ideas as mind maps. Mind maps can be used for many different tasks including to-do lists, brainstorming, holiday planning, research, writing, project management - and in many different environments school, meetings, workspace. Features Node WellNew nodes are created directly on the canvas. There is no need to access the toolbar or the application menu. Multiple Mind MapsThe ability to create multiple mind maps on one canvas makes MindNode an ideal tool for brainstorming sessions. Constrain node width and resize nodesMindNode allows to automatically constrain the width of a node and to resize the node directly on the canvas. No file format lock-inMindNode support a variety of file formats. You can import and export FreeMind and OPML documents (used by many outlining applications) or export the mind map as PNG image, TIFF image, PDF, RTF or HTML document.More Mind Mapping: MindNode Pro (Mac)MindNode Pro builds on the same features as the free MindNode version and adds new functionality (folding, images, visual file links, fullscreen mode,) that helps you improve your productivity. MindNode Pro is available on the Mac App Store and a detailed feature overview is available on mindnode.com. MindNode (touch)MindNode (touch) makes creating mind maps on the iPad, iPhone and iPod touch extremely easy. Create mind maps with the tip of your finger and send them directly to your Mac for further editing. MindNode (touch) is available on the iOS AppStore.