SMFpack

SMFpack is a Mathematica package to calculate genus 2 Siegel modular forms upto arbitrary numerical precision. It calculates the genus-2 Eisenstein series $\psi_{4}$ and $\psi_{6}$ and the cusp forms $\chi_{10}$ and $\chi_{12}$.

The definitions used are in Appendix A of https://arxiv.org/abs/0710.2129.