NetMechanic -
a free online service. Our robot will search your Web site and find
broken links, spot bad HTML tags, and rate your server's response
time.
PNG,
homepage for Portable Network Graphics, a GIF replacement: basics,
features, sample images, technical documentation, tools, and
resources for PNG.
GIF
Clean remove comments etc. from GIF files to make them
smaller.
Wondering what the Web server to CGI program interface is
really all about? Wanting to know the meanings of the various
environment variables supplied by the Web server to a CGI program?
Look at the CGI 1.1
Specification from NCSA.