The first place to go if you want free server-side scripts is your web host. They may already have some commonly used scripts that you can use on your own site. The following table is a summary of where you can go to get other free CGI scripts and hosting.
Introduction of PHP
For more add-ons to make your site interactive see the section on Enhancing Your Website. Remember to check with your web host, they may already have cgi scripts that you can use on your website.