Here is a colleague Sherman Hu Showing his personal mindmapping software to keep track of his life.  Sherman is using the personal brain.
Brain is excellent for doing non-treed mind maps.  Me personally, I am a daily user of MindManager - which helps me organize using a treeing format.  But for my own personal learning of [...]

Free Mind - Open Source Mind Mapping Tool
The Product Link: Open Source Mind Map Software
What It Does: FreeMind is mind-mapping software. Mind Mapping software can be used as a productivity tool.
Keep track of projects, tasks, links to files, keeping track of small notes, brain storming tool, using colours to differeniate, an organizational [...]

The Marketer: IHMC
The Marketing Blurb:“Empowering users to construct, navigate, share and criticize knowledge models represented as concept maps”
Software, self-hosted, no cost if for personal use.
The Product Link:http://cmap.ihmc.us/download/
What it does: Among a lot of other things - CMAP tools is a wonderful product to use when you need to create a concept map of a series [...]

The Product Link: The Watizit Tool
What it Does: This is a brain storming tool that helps with “side-chunking” .  If you want to expand your ideas around a topic - this can be an excellent free tool to use.

The Marketer: Mind Technologies
The Marketing Blurb: Visualize Your Thinking and Organize Your Work
The Product Link: Visual Mind
What It Does:
Stand alone software, 30day free trail available
What it does: Does the mind mapping thing -You will want to have a look at Visual Mind’s product comparison chart before you purchase - to make sure you all [...]