Netlib: Random Number Generators - Source code for various random number generators in C and Fortran, including the well-known RANLIB library supporting many continuous and discrete probability distributions.
NIST: Random Number Generation and Testing - Project to develop a battery of statistical tests to detect nonrandomness in binary sequences, to produce documentation and a software implementation of these tests, and to provide guidance in the use of these tests.
The pLab Project - A server on the theory and practice of random number generation.
Pseudo Random Number Generators - Algorithms for good random number generators with theoretical discussion and software examples.
RANDPOLY - A REDUCE package based on a port of the Maple random polynomial generator together with some support facilities for the generation of random numbers and anonymous procedures. By Francis J. Wright.
RngPack - A pseudorandom number generator package for Java. Source code free under BSD licence.
UNURAN - Universal Non-Uniform RANdom number generators: a GPL library of C functions to generate nonuniform random numbers, by Josef Leydold and Wolfgang Hoermann of the University of Economics, Vienna.