Sasquatch is a search engine that will crawl you site, and show relevant results. Its fast and easy to install on your website. It does not need any database of any kind. It also provides links to the hit results and a nice results page.
DGS Search is a PHP utility that provides an easy to install search utility capable of handling file and database searches on UNIX and Windows based platforms. This package is aimed at supporting the small to medium sized web site. DGS Search will work on any platform that supports a PHP enabled web server such as Linux, FreeBSD, Solaris, and Windows9x/NT/2000. DGS Search can search your website and can also search your MySQL, MSSQL, InterBase or ODBC database. A database is not required for operation.
siteIndexer is a PHP/MySQL-driven complex search and indexing system for small and medium sites. It allows you to index your web pages content and puts it to the database. Also, includes a script to perform searches throught the database.
PHP Search Engine is a full-featured search engine and indexer written in PHP. Features include: All PHP, indexing and searching, no reliance on outside programs; Index is text file, no dbms or databases; Index is completely portable, copy it to any machine using PHP and SEARCpHp, Unix or 'other'; You can index from file system, databases, the web, whatever (If you can access it in PHP, you can index it); Search Engine Math Syntax (-not +must), and Knows if you are using PHP3 or PHP4, and will utilize the proper code.
Wordindex is a full text indexing suite developed using perl as the backend and PHP as the web based search utility. Any language can be used to search as long as it has access to MySQL databases. Wordindex is capable of indexing huge amounts of data, one production system has indexed over 14GB of textual, PDF, and compressed text files. Searches on that system are still less than a second on a modest server. Wordindex is clusterable, the indexing process which can take a very long time to complete on a huge dataset (meaning ~10G+) can be run over a couple nodes to spread out the load.
Simple Web Search allows you to search a SWISH-E index using the SWISH-E 1.X.X Binary and PHP3. Key features include: Limit searches to Head, Title, Body, Heading, Emphasis, and Comment, Display specified meta tag contents, Multiple indices available via drop-down select box, Max number of hits via drop-down select box. (10, 50, 100, 500 are available), Time required to complete search is printed at the bottom of the results page, Four levels of debugging available via config option, and Seperate configuration file.