npb.tar Nonparametric Bayesian estimation subject to overidentified moment equations is a challenge because the support of the posterior is a manifold of lower dimension than the number of model parameters. The manifold therefore has Lebesgue measure zero thus inhibiting the use of the most commonly used Bayesian estimation method: MCMC (Markov Chain Monte Carlo). NPB solves this problem by adapting the MCMC Surface Sampling Algorithm of Zappa, Emilio, Miranda Holmes-Cerfon,and Jonathan Goodman (2018), "Monte Carlo on Manifolds: Sampling Densities and Integrating Functions," Communications on Pure and Applied Mathematics 71, 2609--2647. The SNP density is used as the likelihood. The method is nonparametric because the SNP density is a sieve; that is, a series expansion of a density that is dense in a relevant norm. The package is written in C++. It includes a user's guide, examples, and necessary libraries. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.