Download PhpDig - A spider/search engine that features full text indexing and indexing for PDF, MS-Word and MS-Excel files.

phpBB Amazon Search MOD (Popularity:

) : Allows visitors to search Amazon for products without leaving your phpBB forum. Insert your Amazon affiliate ID and receive commissions for the products sold through your site as well.
Search Engine Script (Popularity:

) : Add search functionality to any website. Included template can be customized to fit the website. It uses a Google API on the backend.
Miniweb 2.0 Site Search (Popularity:

) : Users arrive at a Web site with different agendas. Some wander through the site like window shoppers, while others are on a mission to find a critical piece of information. Whether it is a trade contact, a foreign literature review, ...
QualityPPC (Popularity:

) : This script features 35+ pre-installed XML feeds, a country filter for local/XML traffic, listing by index or rotation, multiple member types for your affiliate, support for PayPal/eGold/MoneyBooker, Online Elite proxy finder, and more.
Interspire FastFind 2004 (Popularity:

) : Add powerful, flexible search to your site. It features a point and click web-based interface, 3-step installation wizard, 100% rebrandable design, automated scheduling, advanced filtering and more.
PowerPPS PPC/PPS search engine (Popularity:

) : A full-featured PPC and PPS search engine. A modular system allows easy inclusion of other search engines. It features GeoTargeting, GZip, fraud protection, affiliate and advertiser section, fraud analysis tools, stat analysis and more.
Sphider (Popularity:

) : A lightweight web spider and search engine written that is suitable for adding search functionality to small or medium sites (10k-20k pages). It can index both static and dynamic pages, supports NOT and phrase searches, and more.
PHPgoogleSearch (Popularity:

) : A small script that allows your visitors to search the web using Google API. You can configure the script, adding features such as site thumbnail preview, image opening in new window and more.
SearchSite Professional (Popularity:

) : This search engine can index and search by meta data, page content and titles, but allows for unlimited searches to index various pages and portions of your site. Results can be customized to through the use of templates and CSS. ...
Softbiz Pay Per Click Search Engine Script (Popularity:

) : A pay-per-click search engine for your web site. Members can signup to add their site. For each website that member adds, he can specify multiple relevant keywords with different bids. Sites are also arranged in a multilevel hierarchy. Members can ...