cgic - CGI C/C++ Library
http://www.boutell.com/cgic/
cgi-lib.pl
http://www.bio.cam.ac.uk/web/form.html
CGI::* Modules
http://www-genome.wi.mit.edu/WWW/tools/scripting/CGIperl
EIT's CGI Library for C/C++
http://wsk.eit.com/wsk/dist/doc/libcgi/libcgi.html
Grant's CGI Framework for the Macintosh
http://arpp1.carleton.ca/grant/mac/grantscgi.html
libwww
/CPAN/modules/by-authors/Gisle_Aas
Python CGI Library
http://www.python.org/~mclay/notes/cgi.html
uncgi
http://www.hyperion.com/~koreth/uncgi.html