PHP

PHPOpenChat is a high performance php-based chat server software for a live chat-room or -module on every php-based site.

This PHP IP sniffer program will sniff out the IP address of your website visitor and email you the information without notifying the visitor.

JSMin is a filter which removes comments and unnecessary whitespace from JavaScript files. It typically reduces filesize by half, resulting in faster downloads. It also encourages a more expressive programming style because it eliminates the download cost of clean, literate self-documentation. This is a PHP version/port of the original C code.

Free PHP script to automate link exchange page, it lets people add their own link to your page instantly and has an option to check for the existence of your reciprocal link first. If your link exists your visitor's link will be added to the database and displayed on your page, if it does not exist they will be asked to add your link first and try again.

Sphider is a lightweight web spider and search engine written in PHP, using MySQL as its back end database. It is a great tool for adding search functionality to your web site or building your custom search engine. Sphider is small, easy to set up and modify, and is used in thousands of websites across the world.