Pi as RNG
  A Million Random Digits - THE ONLY published source that has a million random digits. 1 Million Digits of Pi with no spaces!
Crazy Amounts of Map Info!  
Map Projections About This Web Site
  Cartographic map projections  
Modular Math  
Bar Codes ActiveBarcode- More than you wanted to know!
Bar Code Types

Another nice QR Code generator
  QR Stuff.net Barcodes as Art!
Cryptography Codes and Ciphers - LOTS of Resources
Matrices in Cryptography Cryptographic Compendium

How math saved the world - PDF


Prime Numbers used in encoding
(3 min video)