The diehard tests are a battery of statistical tests for measuring the quality of a random number generator. They were developed by George Marsaglia over several years and first published in 1995 on a CD-ROM of random numbers.
The NIST test suite was launched by the National Institute of Standards and Technology (NIST) in 2001 .It is a statistical package consisting of 16 tests that were developed to test the randomness of arbitrary long binary sequences produced by either hardware or software based cryptographic random or pseudorandom number generators.
The ENT is a statistical test designed by the J. Walker engineers in Switzerland in 1998 to detect the characteristics of random sequences.
TestU01 was first introduced in 2007, by Pierre L’Ecuyer and Richard Simard of the Université de Montréal.The library is a software library, implemented in the ANSI C language, that offers a collection of utilities for the empirical statistical testing of uniform random number generators (RNGs).