Linux Manual Pages
The Linux Documentation Project maintains an archive of snaphots of the (English language) core Linux manual pages that are maintained by Michael Kerrisk. Corrections and additions are welcome, but review the "Help Wanted" list, first.
Man pages belonging to programs are usually distributed together with those programs. Therefore, the core Linux man-pages mainly contains the pages for system calls and library routines, special devices, and file formats. However, it also contains documentation for a few programs, in cases where the authors or maintainers of the program do not distribute man pages themselves.
The latest version is man-pages-3.55.tar.gz (1.8Mb) (TLDP mirror), or man-pages-3.55.tar.bz2 (1.2Mb) (TLDP mirror). Older snapshots are archived in TLDP's manpages directory.
HTML/Web versions of Linux man pages
Man pages are authored using the traditional troff typesetting format, which dates back to the early days of UNIX. There are several sources for man pages in the more modern HTML format.
A tarball containing an HTML-based compilation consisting of core man-pages, and several other sources, can be downloaded from the man-html directory. Sam Varshavchik maintains a browsable/searchable version of this compilation at http://manpages.courier-mta.org.
Other useful search and/or indexed compilations of man pages can be found at: