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Search simultaneously several search engines. Uses a fast metasearch algorithm. Results and dns cache system. PPC and major search engines included.
Price: $169.00

CyberCrawl Meta Edition is a fully modular MetaSearch-Solution. The Script (written in PHP3) queries multiple SearchEngines (expandble through easy to handle includes) and delivers the top 10 results in arrays, seperated by Link and Description.
Price: Free (GPL)

DMR is a portal page creation system. DMR acts as a jack of all trades form, which allows for URL redirection as well as an interface to various search engines through its aliasing system. A DMR user can create aliases to any web/ftp site, complete with functional arguments. DMR keeps a history of all the URL's passing through it, so you'll never lose your place due to an unstable browser. The user interface is created within DMR, using regular HTML which can be as simple or as advanced as you like. The author recommends that it be served from a machine on your LAN for fastest access to the Web.
Price: Free

Simply, this script allows one to either search the web, or to search Google's index of a particular website. It is simple, easy to install and may have portions of it customizable by editing a background file.
Price: Freeware

With this script you can be up and running your own Google search engine in just seconds! The Google Search Script uses the Google web API, PHP, and nusoap to get results for your site. Just upload your files, enter your web sites title, Google Key, and you are up and running. The script displays search results 10 per page, supports google's suggested spellings, lets you search just you sites google listing, return result in just your language, compress HTML output, and is 100% template based.
Price: Freeware

As a webmaster you might know that the search engine Google does an update mostly once a month. Several days before the updated database is available at www.google.com you can get a preview of the new data index at www2.google.com and www3.google.com.
Price: Freeware

This simple script allows you to display the Google search results on your site in your own layout. It uses SOAP and PHP. The script is written in French, but very simple, even if you speak only English.
Price: Free (PHP License)

Uses eMail to query Google and get results via eMail back. Source code is included. Uses the Google SOAP API.
Price: Free

Create your own MP3 Search Engine. MetaMP3 searches AstraWeb and MP3.Box for mp3 results and displays them on your website. The script is fully customizable to match the design of your website.
Price: Free (GPL)

It's a really handy script that gives the user option to search on 23 different search engines including Scour, AVFind, AudioFind and lots more. It also has the ability to provide lyrics for a particular song you search.
Price: Free (GPL)