FreeMind

FreeMind conforms to the de facto style that most mind mapping programs follow: A main navigation bar across the top of the workspace, which provides buttons for common operations, such as adding a child topic to your map or applying formatting to text (bold, italic, fonts, sizes) and a drop-down box to change the magnification of your map within the workspace. A vertical toolbar along the left side of the workspace contains map icons. FreeMind gives you multiple ways to navigate around your map, including clicking on the map background and dragging it around, as well as horizontal and vertical scrolling of your map using the mouse wheel. FreeMind's developers believe that this is one of the program's most unique features. Clicking on a node in your map causes all child topics below it to fold into the currently selected topic, so they are hidden from view. This can be a great way to reduce visual clutter when you're working on your map, so you can concentrate on the branch you're currently working on.
FreeMind gives you plenty of flexibility when you want to rearrange the topics of your map. You can drag and drop single or multiple selected nodes in a map from one location to another. FreeMind is designed to intelligently handle information pasted into it from other applications. For example, if you paste HTML into a map that contains hypertext links, the program will automatically parse them out and treat them as links in your map. It can also convert text to parent and child topics, based on the number of leading spaces in front of a line of text. In addition, FreeMind can recognize and capably handle rich text format (RTF) text from Microsoft Office applications, including WordPad, Outlook and Word.