TOMS322 is a C library which computes Fisher's F-ratio test.
The original C source code for this program, as written by Mark Johnson, is available at http://www.netlib.org/opt/hooke.c
The computer code and data files described and made available on this web page are distributed under the GNU LGPL license.
TOMS322 is available in a C version and a FORTRAN77 version.
DCDFLIB, a C++ library which evaluates and inverts a number of statistical distributions.
GSL, a C++ library which includes many routines for evaluating probability distributions.
NORMAL, a C library which samples the normal distribution.
PROB, a C++ library which evaluates many probability density functions.
TEST_VALUES, a C library which contains sample values for a number of distributions.
UNIFORM, a C library which samples the uniform random distribution.
You can go up one level to the C source codes.