Here is a list of useful diagram, mapping and visualisation applications:

http://80legs.com/
http://gephi.org/
http://www.nullpointer.co.uk/-/webtracer2.htm
http://www.graphviz.org/
http://www.smartdraw.com/
http://home.snafu.de/tilman/xenulink.html
http://www.cytoscape.org/
http://writemaps.com/
http://astuteo.com/slickmap/
https://bubbl.us/
https://gomockingbird.com/
https://pidoco.com/en
http://www.gliffy.com/
http://www.diagram.ly/
http://www.lovelycharts.com/

http://htmleditors.shadowboxcreative.ca/2007/12/13/sitemap-diagrams-using-omnigraffle-applescript-and-a-google-sitemap/
http://blog.fuzzymath.com/2010/08/05/omnigraffle-sitemap-generator-from-sitemap-xml/
http://office.microsoft.com/en-us/visio/

Feel free to add any that you think deserve to be mentioned.

#visualisation #visualisationtool #seo