CGI

CGI software can put useful features behind a website, from shared calendars and contact directories to form handling and site search. TWiki gives you editable pages, attachments, search, and revision control when a team needs a shared workspace. Calcium offers browser calendars with repeating events and email reminders; Handy Address Book CGI lets you share contacts with different access levels.

For a more focused job, Universal Mailer handles form submissions, FM SiteSearch Pro adds search to a website, and libapreq helps Apache code process client request data. Some entries are complete web applications, while others are scripts or libraries to build into your own site. Check each project's language, web server requirements, and lifecycle before installing it. That helps you choose between a ready-made service and code you can adapt.