Link Checker
This is a script that crawls every page of a site, and detects broken links and redirects

Hyaloide
Hyaloide Links is a link indexing script that doesn't require any database.

Tutorial Ms
TutorialMS is an open source script that helps webmasters index and manage tutorials (written by them or by another site). It is designed so users can easily find the tutorial(s) they are looking for.

If-CMS
If-CMS is a very flexible dynamic website engine for group of people as well as single person, capable of building sites from several pages to several thousand.

Ss Links
ssLinks is an open source PHP and mySQL powered links database which allows users to run a database driven categorised links section on a web site - similar in structure to Yahoo or any other categorised links collection.

P-links
plinks is a Php LINK manager, or bookmark manager in php. It is intended to be extremely usable in a private/group environment, displayed in a yahoo style directory listing.It is searchable, themeable and template driven.

Open LD
OpenLD is a free extension/plugin-based directory script written in PHP.

PHP DIRECTORY
phpDirectory is a PHP application that allows you to easily run a links directory system on your web site.phpDirectory's features include search engine, suggest link, browse categories and admin tools. Each link entry have its own counter, vote and rate.

Pao Link
This script allows you to automate links exchange and to increase the number of visitors on your website. Your visitors can suggest a link from a form. You can set to receive an e-mail when a visitor suggests a link. The administrator can approve in admin area the suggested link before pubblishing.

Tg Reffers
This is the ultimate link trading PHP script that automatically tracks referrers to your website! It is completely customizable with detailed statistical analysis, an approval system, secure administration control panel

Link Spider
Linkspider allows other webmasters to trade links with your site, check if your link exist on their site and is it your link hidden somewhere in script, comment, etc.