Indium

The Indium real random number generator is without doubt the largest most complex random number generator ever designed. It uses all the major data encryption algorithms, one way hash functions, and pseudo-random number generators available. It is completely free and in the public domain. It is a open source project and all 900+ C source code files are included. It will use a internet connection if you have one to get numbers over the net.

It will also use a radio signal to help generate its output. You do not need to have an Internet connection or a radio for it to run. The numbers it generates are real random numbers meaning that the stream of numbers can not be reproduced, this makes it very useful in cryptographic applications.