CPAN: http://www.cpan.org/
libwww: http://www.linpro.no/lwp/
SSLeay:
FAQ: http://psych.psy.uq.oz.au/~ftp/Crypto/
Download: FTP://ftp.psy.uq.oz.au/pub/Crypto/SSL/
Documentation: http://www.cryptsoft.com/ssleay/doc/
HTTP:
http://www.w3.org/Protocols/HTTP/HTTP2.html
http://www.ics.uci.edu/pub/ietf/http/rfc1945.html
http://www.cis.ohio-state.edu/htbin/rfc/rfc2068.html
SNPP: http://www.cis.ohio-state.edu/htbin/rfc/rfc1861.html
Other paging protocols: http://www.pcia.com/wireres/protocol/links.htm
Web-based paging gateway list: http://www.refreq.com/PagingBody.htm
All listings referred to in this article are available by anonymous download in the file ftp://ftp.ssc.com/pub/lj/listings/issue66/3531.tgz