PHP
PHP (PHP: Hypertext Preprocessor) is a widely-used general-purpose scripting language that is especially suited for web development and can be embedded into HTML. It generally runs on a web server, taking PHP code as its input and creating web pages as output. It can be deployed on most web servers and on almost every operating system and platform.
Most free servers, like Freewebz or Geocities, do not support PHP. You may have to look into a paid domain in order to use it, however, you can also find many sites that will remotely host the scripts for you.
PHP can be used for visitor counters, guestbooks and much, much more ... but by far the most convenient part of PHP is being able to use the PHP includes function. Use the menu below to browse the scripts.