The HEALPix documentation is currently available for downloading in pdf files, in a single epub file and can be browsed in html

The HEALPIX primer pdf
(0.66 MiB) 		epub
(3.65 MiB) 		html

     
HEALPIX Facility Installation Guidelines pdf
(0.63 MiB) 		epub
(3.65 MiB) 		html

     
HEALPIX Fortran90 Facilities User Guidelines pdf
(0.75 MiB) 		epub
(3.65 MiB) 		html

     
HEALPIX Fortran90 Subroutines Overview pdf
(0.92 MiB) 		epub
(3.65 MiB) 		html

     
HEALPIX IDL Facilities Overview pdf
(1.68 MiB) 		epub
(3.65 MiB) 		html

     
HEALPIX C Subroutines Overview pdf
(0.21 MiB) 		epub
(3.65 MiB) 		html

     
HEALPIX C++ Facilities and Subroutines Overview     html

     
HEALPix Java Overview     html

     
HEALPix Python Overview (healpy)     html