SmartPPC Search Engine
- Uses PHP and MySQL to keep advertiser/affiliate data, listings, full statistics, payment history, status, settings.
- http://www.orbitscripts.com/smartppc.html

PHP Link Directory
- Software for running a link exchange or professional directory sorted by categories.
- http://www.phplinkdirectory.com/

Free Directory Script
- Offers a free feature php based web directory script.
- http://www.freedirectoryscript.com/

Link Department
- Link management script with advanced yet easy to use admin control panel, fully template driven appearance, static HTML front-end and email notifications.
- http://hitcode.mywebftp.com/products/linkdept/

LinksCaffePRO
- A mySQL/PHP4 portal solution that allows to run Yahoo-style directory.
- http://gonafish.com/index.php?id=1

InLink
- Commercial PHP portal-solution for running a Yahoo-style directory directly from a web site. Supports SQL, MySQL, PostgreSQL.
- http://www.in-portal.net/in-link/

Aardvark Topsites PHP
- A topsites script. [Open source, GPL]
- http://www.aardvarktopsitesphp.com/

phpOpen
- Make a version of the Open Directory with this free PHP script.
- http://sourceforge.net/projects/phpopen/phpOpen/

SkaLinks
- A link manager with links checking and advanced advertisement system. [Freeware]
- http://www.skalinks.com/

PHPMini Links
- A link portal, which allows guests to add links as well. [Freeware]
- http://www.phpmini.com/downloads/links.php

GentleSource Link and Bookmark Manager
- Link manager can be used as link section of a website or a personal bookmark manager. You can publish links/bookmarks or hide them behind a login. [Free for private usage and non-profit organizations]
- http://www.gentlesource.com/link-manager/

evoTopsites
- Advanced top site software that functions as a toplist, link directory, and/or webring. Built on top of PHP/MySQL and features dynamic hit tracking. [Freeware, req. registration]
- http://www.evo-dev.com/products/evotopsites/

Jade
- A PHP and MySQL based directory and search engine application that works with templates.
- http://www.jadetown.com/

K-Search
- Pay Per Click/MetaSearch script [Commercial]
- http://turn-k.net/k-search

K-Links Directory
- Professional link indexing solution [Commercial]
- http://turn-k.net/k-links

ScriptRocket Top Site
- PHP Script for creating and run Top Sites. [Commercial]
- http://www.scriptrocket.com/tstopsite.php

Monster Top List
- Topsites script with webring, dynamic list position imaging, and RSS feeds. [Commercial]
- http://www.monstertoplist.com

Softbiz Automatic Link Checker
- 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.
- http://www.softbizscripts.com/automatic-link-checker-script-features.php

Softbiz Resource Repository Script
- Run own software repository site like hotscripts. Customizable colors and graphics. Demo available.
- http://www.softbizscripts.com/resource-repository-script-features.php

Softbiz Link Directory Script
- Run own business link directory like dmoz. Customizable colors and graphics. Demo available.
- http://www.softbizscripts.com/link-directory-script-features.php

aeDirectory
- A free PHP link directory script allows to build theme links directory.
- http://www.aewebworks.com/aedirectory.htm

Google API Search Script
- Free PHP script to search Google. Can be reistricted to search one site and language. Requires Google free license key. [Freeware]
- http://www.wwwsearchsolutions.com/google.php

X-Power Links
- A links management script with advanced, but easy to use admin control panel, fully template driven appearance, static HTML front-end. [Commercial]
- http://www.xpowerlinks.com/

Site Search Pro
- A PHP fully-functional search engine for web site. Online demo. [Commercial]
- http://www.site-search-pro.com/

iSearch
- A PHP/MySQL script for allowing visitors to a website to perform a search on the contents of the site. Includes multiple language support. [Free and Commercial]
- http://www.isearchthenet.com/isearch/

PhpDig
- A search engine written in PHP that uses a MySQL database backend. It features indexing of both static and dynamic pages and full text indexing.
- http://www.phpdig.net/

eDirectory
- Application to manage online directories. Includes news, examples and FAQ.
- http://www.edirectory.com/

phpLinks
- A free link-farm, search engine PHP script that uses MySQL.
- http://sourceforge.net/projects/phplinks/

FlexPHPLink
- A link management system allows to add, edit or delete links , easy internationalization, cheap customize service. [Freeware]
- http://www.china-on-site.com/flexphplink/

WSN Links
- 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]
- http://scripts.webmastersite.net/wsnlinks/

phpYellow Pages
- A generic directory builder to create free or paid directory [Free and commercial versions]
- http://phpyellow.com/

Link Up Gold
- Features unlimited categories and links, rating system, maillists, editor's pick, sponsors, and multiple languages.
- http://www.phpwebscripts.com/linkupgold/

OpenRealty
- A free, open source PHP real estate listing manager that uses a MySQL backend.
- http://jonroig.com/freecode/openrealty/

phpODP
- Add the content of The Open Directory Project to site. Let search, browse the categories. Also support for targeted advertising.
- http://www.bie.no/products/phpodp/

Jax Link Lists
- An online hyperlink list manager for small link lists.
- http://www.jtr.de/scripting/php/linklists/index_eng.html

ScriptsCenter.com
- A couple of commercial scripts, including AutoLinks+ and EzUpload.
- http://www.scriptscenter.com/

phpHoo
- A PHP script using MySQL that will display a "Yahoo-like" directory.
- http://www.cable-modems.org/phpHoo/