Sphider is a light search-engine package for adding your own search-function to one or a handfull of websites.
 Why you'd want it
It's a pure PHP search-engine which stores the search-data in a MySQL database. It's a typical LAMP application which runs on any *nix server.
 What it's not
It's not designed to be a "near-global" search-engine like YaCy or Google, it's made for a few sites.
The DataparkSearch Engine may be a better choice for a hundred or a thousand websites, Sphider
- Allows you to add a "search" feature to any website(s).
- It's GNU Software written by Ando Saabas.
- Runs on any LAMP server.
- You index your sites manually using a php command (which can be cronned).