Mindmapping books & software
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A great resource for any kind of mindmapping (Digital or Analog) is The Mind Map Book by Tony Buzan author of Use Both Sides of Your Brain. The Latter book was my introduction into mindmapping, which allowed me to see the big picture of any project that I attempt.
I use Mindmanager Pro ver 7.0. I've been with Mindmanager since ver 3.0 when it was known as Mindjet.