ASA245 is a C++ library which evaluates the logarithm of the gamma function.
ASA245 is Applied Statistics Algorithm 245. Source code for many Applied Statistics Algorithms is available through STATLIB.
The computer code and data files described and made available on this web page are distributed under the GNU LGPL license.
ASA245 is available in a C version and a C++ version and a FORTRAN90 version and a MATLAB version.
FN, a C++ library which approximates elementary and special functions using Chebyshev polynomials, by Wayne Fullerton.
GSL, a C++ library which includes many routines for evaluating special functions.
SLATEC, a FORTRAN90 library which evaluates many special functions.
SPECFUN, a FORTRAN77 library which evaluates certain special functions using fitted data.
TEST_VALUES, a C++ library which contains sample values for a number of distributions.
TOMS291, a C++ library which evaluates the logarithm of the Gamma function.
You can go up one level to the C++ source codes.