Pay Per Click Professional
Allows to run a PPC search engine similar to Overture. [Commercial]

ProLinkz
A CGI script that will let you easily track, redirect/disguise and manage all your site's internal and promotional links. [Commercial]

WebLinks Web Directory Generator
This software can build Yahoo style Web directory. WebLinks is an add-on feature of the BizDB Web database software.

Turbo Seek
Yahoo style directory and search engine with ease. [Adv shareware]

RuterSoft
A search engine software written in perl with spidering, administrative control and advanced syntax features.

WebUMake LinkTree
Allows setting up searchable links directory. Pages are static HTML for fast display and low server load. Can modify or delete links. Setup to instantly add links, or require moderator approval.

MonoPro Link System
Create portal-style link directory with multiple categories and subcategories. [Commercial, online demo]

Cougasoft
Free CGI scripts - emphasis on link-management. [Collection]

mySearch
A free, open source search engine script. 1 file installation, no administration required with free installation and support.

My little Webring
A free script written in perl which allows you to master a webring. Has most of the features that Yahoo webring has, but with no ugly "navbars".

WhiteBuilder
A self-administered people search designed to set up a professional white pages on the web. [Commercial, Demo]

Kiss Site Search Engine
Internal search engine for the Web site written in Perl. [Freeware]

Client Promotion System
Software for automated search engine submission business with and charge monthly membership fees. [Commercial]

NetTracker
Commercial Perl scripts with a focus on traffic and links.

Advanced Search Ranking System
CGI scripts which allows creation of Altavista or Excite style search engine. [Commercial]

Directory Pro
CGI scripts written which allows creation of own Yahoo or Dmoz style directory.

Raven Links Directory
A free Perl script that allows setup and use a Link Directory. It supports a Link Directory Search, FFA/FFAL (Free For All Links), and Reciprocal Link Directory.

YellowMaker
A self-administered business directory designed to set up a professional yellow pages on the web.

Free For All Links (FFA)
A powerful script for allowing people to add their links to site. [Shareware]

SmartPPC
Offers PPC search engine and toolbar. Includes news, demo, forum and product description.

PowerSeek SQL
Search engine and directory portal application with customization features. Demo, support forum and installation instructions.

RiSearch
Simple, powerful and fast search engine. [For non-commercial]

HTML Site Index Generator
An multi-page HTML site index generator that easily handles virtual domains.

Friendly Links
An user-friendly links exchange management and directory publication system in Perl that provides a complete links directory management mechanism for a website. By Friendly Infosys Corporation. [Commercial]

SearchToSale
A script that puts a search box on site, and allows redirect to specific URLs based on matches to the search term. [Commercial]