lwty.org - worksheets or practice exercises, calculators & answer sheets to engage the grade school...
RANDOM.ORG - RANDOM.ORG offers true random numbers to anyone on the Internet.
Free42 - Free42, an HP-42S calculator simulator
GeneratorMix - A place with hundreds of generators split into different categories from science to entertainment.
Calculator OSX App - Real Time.
Random Number Generator - Randomly generate integers or floating point numbers within a given range and specified discrete or continuous statistical probability distribution.