BETA_NC is a FORTRAN77 library which evaluates the cumulative distribution function (CDF) of the noncentral Beta distribution.
BETA_NC is available in a C version and a C++ version and a FORTRAN77 version and a FORTRAN90 version and a MATLAB version.
ASA063, a FORTRAN77 library which evaluates the incomplete Beta function.
ASA109, a FORTRAN77 library which inverts the incomplete Beta function.
ASA226, a FORTRAN77 library which computes the CDF of the noncentral Beta distribution.
ASA310, a FORTRAN77 library which computes the CDF of the noncentral Beta distribution.
DCDFLIB, a FORTRAN90 library which evaluates and inverts a number of statistical distributions.
GSL, a C++ library which includes many routines for evaluating probability distributions.
PROB, a FORTRAN90 library which evaluates and inverts a number of probabilistic distributions.
TEST_VALUES, a FORTRAN77 library which contains sample values for a number of distributions.
TOMS179, a FORTRAN77 library which evaluates the incomplete Beta function.
TOMS708, a FORTRAN77 library which evaluates the incomplete Beta function.
You can go up one level to the FORTRAN77 source codes.