Mind Maps

If you would like to make some nice mind maps or flow charts you can try the following two sites.
First is

click here to link 

When you go to their site, you will see an example that looks like the following:

Text2Mindmaps converts text into mindmaps which are great for the visual learner.  You just edit the text in the left text box.  You can grab any of the text boxes and rotate or move their location.  When you are done just click on the "Draw Mind Map" button.  Then you can then "save" them in pdf form.  Here is an example I did for the analysis of Intersections of three 3 dimensional planes .

Another site one can use for mind maps is Lucidchart

click here to go to their site

See the following videos

Their software is not free unless you are a teacher or student :)