The CGI Center provides ten extremely popular read-to-go CGI programs.  The CGI Center will allow you to customize your options and then will provide you with the HTML to copy and paste in order to make it all work!
Simple CGI Wrapper: This is a cgi wrapper that will allow you to run a cgi script with your userid.
Random HTML: This is a random HTML generator.  It pics an HTML string out of a list that you provide, and inserts it an SSI enabled webpage.  Example Usage: Random Quotes on a site.
Guest Book: A simple guest book for visitors to a site to sign and view.
Counter: Allows you to customize a counter to place on your web site.  Colors, fonts, sizes, etc. can all be changed.
Clock: Creates a real-time JAVA clock for your web site.  Like this counter, all options can be customized.
CGI E-mail: Provides the code to allow forms to be setup so that the results are e-mailed to you. 
Entropy Search: Creates a full site search engine. 
Entropy Banner: Setups a banner rotation script for your site.