This site is built using WordPress.
Most of our sites use Genesis by Studio Press as a foundation. The current theme in use on FDmaps.com is Megalithe by Zigzagpress.
Some of the plug-ins include:
Basic Google Maps Placemarks
Gravity Forms
TablePress
Some third party sites and software for mapping:
MapBox
TileMill
Tableau Public
GeoCommons
Quantum GIS Lisboa
ESRI
And of course Adobe Photoshop and Adobe Illustrator.
Some of the icons used were created at map icons collection.
Here’s a useful link from NCSU for county GIS data.
The secret ingredient as always: hard work.