http://www.webreger.com/
Web design & Hosting solutions. Special shared hosting accounts to run Sphider Pro.

http://www.sphider.eu/
The original script, developed by Ando Saabas.

http://www.php.net/
The PHP Manual is available online in a selection of languages.

http://www.mysql.com/
MySQL is the world's most popular open source database software, with over 100 million copies of its software downloaded or distributed throughout its history.

http://dev.mysql.com/doc/
The MySQL Reference Manual covers most areas of MySQL use. This manual is for both MySQL Community Server and MySQL Enterprise Server.

http://www.checkupdown.com/status/error1.html
The error codes a client may receive are described in details, and further actions to fix the HTTP errors are recommended.

http://www.gnu.org/copyleft/gpl.html
GNU General Public License.

http://httpd.apache.org/
The Apache HTTP Server Project

http://www.linux.org/
The Linux Project

http://www.w3.org/standards/
W3C standards define an Open Web Platform for application development that has the unprecedented potential to enable developers to build rich interactive experiences.

http://www.thesitewizard.com/apache/index.shtml
How to Configure your .htaccess files, Install and Configure the Apache web server.