This page is under construction - it will house and/or link to numerical computations and graphics related to Stieltjes constants undertaken, off-and-on, since the publication of "Newton-cotes integration for approximating Stieltjes (generalized Euler) constants" in Mathematics of Computation in 2003 (see publications tab for details about that paper, including a .pdf copy).
These Stieltjes-related numerics and graphics have been housed at various university websites over the years; but unfortunately website redesigns have made them temporarily unavailable as of September 2022. I hope to have the old materials posted here by December 2022.
(For instance, sites such as http://www.tamu-commerce.edu/math/FACULTY/KREMIN/stieltjes/stieltjestestpage.html and http://faculty.colostate-
pueblo.edu/rick.kreminski/stieltjesrelated/sigmavalues2005.txt that have been referenced elsewhere no longer exist at those domains, but will eventually be posted here late in 2022.)