Cogspace is not software available for download or use in making your own maps, but it’s an interesting attempt at 3D information presentation.
The sole example, covers limited knowledge domains on three axes. Though not strong on visibility, it allows some dynamic exploration by rotation and the recall of text notes associated with the small topic balls.
Explore here http://www.cogspace.net/index2.html
It moved: http://www.michaelgaio.com/cogspace/ [Updated by Roy: 7 Feb 2014]
Vic Gee (@VicGee on Twitter)
http://www.informationtamers.com/mind-mapping/
The master list of mind mapping &
information management software