Flexagon Re'flex'ions  
   Several possibly new trihexaflexagon phenomena are presented. The wide spectrum of findings including explorations with magic squares, palindromes, and much more freshly fans the flexagon fun.
   http://hometown.aol.com/verndrei/flex00.html

Flexagons and How to Make Them  
   Instructions on how to make a flexagon with pictures and an short introduction to flexagons.
   http://www.sherston.freeserve.co.uk/HTML/Mathematics/Flexagons.htm

Flexagons  
   Includes a definition of the word, instructions on how to make a Trihexaflexagon, how to flex it and information about it and another flexagon.
   http://www.mathematische-basteleien.de/flexagons.htm

Hexaflexagon Toolkit  
   A free application that can generate a hexaflexagon template and folding instructions from six user selected images. Examples Source Code included.
   http://hexaflexagon.sourceforge.net