Online

• Number base converter: http://convertxy.com/index.php/numberbases/

• Binary Translator: http://paulschou.com/tools/xlate/

• QR Reader: http://zxing.org/w/decode.jspx

• Binary to Hex and back: http://i-tools.org/bin2hex

• Image Ops: http://imgops.com/

• Cipher Tools: http://rumkin.com/tools/cipher/

• GCA Toolbox: http://geocaching.com.au/toolbox/

• Geocaching Toolbox: http://geocachingtoolbox.com/

• List of other sites, including parmstro (see below):http://www.winterdragon.org/index.php?page=puzzle-sites

• Introduction to cryptocaches by tenebrus: http://berkshiregeobash.com/gsak/Geocache-Cryptocaches-ver-1.01-by-tenebrus.pdf

• Puzzle pages by Parmstro: http://parmstro.weebly.com/solving-puzzles.html

• Solve My Math: http://www.solvemymath.com/

• RSA Calculator: https://www.cs.drexel.edu/~jpopyack/IntroCS/HW/RSAWorksheet.html

• Tineye Image finder: http://www.tineye.com/

• Braingle: http://www.braingle.com/brainteasers/index.php

• Numberworld: http://numberworld.info/

• Alphametric Puzzle Solver: http://www.tkcs-collins.com/truman/alphamet/alpha_solve.shtml

• kenny translator http://www.namesuppressed.com/kenny/

• HTML Color Picker: http://www.infobyip.com/htmlcolorpicker.php

• Radius Around a Point  http://www.freemaptools.com/radius-around-point.htm