combiPythonic package for combinatorics
RcppAlgosTool for Solving Problems in Combinatorics and Computational Mathematics
resamplrR package cross-validation, bootstrap, permutation, and rolling window resampling techniques for the tidyverse.
lattice-symmetriesA package to simplify working with symmetry-adapted quantum many-body bases. Provides a good foundation for writing custom exact diagonalization and variational Monte Carlo software
streamplifyJava 8 combinatorics-related streams and other utilities