FreeMind
Want to move into mind mapping without shelling out a schilling? is as free as it gets. This open-source download is plenty robust, with ample support for pasting into Office apps, the ability to link to the Web from within your maps, and a flexible range of map styles to suit a variety of uses. FreeMind is a good place to start in MindMapping, because its XML file structure exports easily into other mind mapping apps.
XMind
The freemium is another great option for breaking into the mind-mapping game. It's cross-platform, so you can download it for Windows or Mac, and it's heavily cloud connected, so you can save your maps to the Web and share them with others.
XMind Pro, which costs $40 per year, adds more control over map sharing, and includes excellent templates for task management, gantt charts, and a bunch of other powerful business uses.