HEALPix
Data Analysis, Simulations and Visualization on the Sphere
...Please acknowledge HEALPix by quoting the web page http://healpix.sourceforge.net (or https://healpix.sourceforge.io) and publication: K.M. Gorski et al., 2005, Ap.J., 622, p.759
Full software documentation available at https://healpix.sourceforge.io/documentation.php
Wiki Pages: https://sourceforge.net/p/healpix/wiki/Home
Exchanging Data with HEALPix (in FITS files): https://sourceforge.net/p/healpix/wiki/Exchanging%20Data%20with%20HEALPix/
GDL and FL users should read https://sourceforge.net/p/healpix/wiki/HEALPix%20and%20GDL/