XAMPP is a free and open source cross-platform web server package, consisting mainly of the Apache HTTP Server, MySQL database, and interpreters for scripts written in the PHP and Perl programming languages. XAMPP is also for localhost development and testing
If you want to know more anddownload the source follow the link below
http://www.apachefriends.org/en/xampp.html
If you want to know more and
http://www.apachefriends.org/en/xampp.html