Corrfunc is a suite of high-performance clustering routines. The code can compute a variety of spatial correlation functions on Cartesian geometry as well Landy-Szalay calculations for spatial and angular correlation functions on a spherical geometry and is useful for, for example, exploring the galaxy-halo connection. The code is written in C and can be used on the command-line, through the supplied python extensions, or the C API.
https://ui.adsabs.harvard.edu/abs/2020MNRAS.491.3022 ; see additional citation information here: https://github.com/manodeep/Corrfunc#citing