Link directory script which allows to organize links into unlimited categories and subcategories. [Open Source, GPL]

A links management script with advanced, but easy to use admin control panel, fully template driven appearance, static HTML front-end. [Commercial]

A fully templated searchable links portal. Option to auto-notify admin of submissions and submitter of approval via email. Users may rate, email, report, and comment on each link. [Free with crediting text in footer, or commercial]

Run own software repository site like hotscripts. Customizable colors and graphics. Demo available.

Run own business link directory like dmoz. Customizable colors and graphics. Demo available.

Link validator tool written in PHP helps to check automatically if a page contain a link back to site. Helpful especially in link exchange or link popularity campaigns.

Uses PHP and MySQL to keep advertiser/affiliate data, listings, full statistics, payment history, status, settings.

A link manager with link checking and advanced advertisement system. [Freeware]

A fully-functional search engine for web site. Online demo. [Commercial]

Web Software for creating and run Top Sites. [Commercial]