I’m the author and maintainer of the following tools:

Website
wilf – A web application to explore symmetry and Wilf classes of permutations

Website | GitHub | Hackage
hops – Handy Operations on Power Series. This package provides a scripting language for generating functions and an accompanying interpreter

Website | GitHub | Hackage
sloane – A command line interface to Sloane’s On-Line Encyclopedia of Integer Sequences (OEIS)

GitHub | Hackage
sym – Definitions for permutations with an emphasis on permutation patterns and permutation statistics

GitHub | Hackage
spe – Combinatorial species lite

GitHub | Hackage
opn – Open files or URLs using associated programs

All my public code can be found on GitHub: https://github.com/akc/