Packages 
Package Description
cds.healpix
Implementation of the HEALPix framework.
Reference papers are: [Gorsky2005] - "HEALPix: A Framework for High-Resolution Discretization and Fast Analysis of Data Distributed on the Sphere", Górski, K.
cds.healpix.common
General codes not specific to HEALPix.
cds.healpix.common.math
Package dedicated to math functions and bits hacks.
cds.healpix.common.sphgeom
Contains some spherical geometry classes.
cds.healpix.fillingcurve
Package dedicated to space filling curves.