Open-source language and products are becoming dominant on Web sites. Few of those are PHP, Python, Perl, Ruby on Rails (Ruby), MYSQL, Apache, etc. Few Advantages are Cost, Agility, Scalability etc.

PHP

PHP is an embedded templating / programming language similar to ASP. PHP is a very capable web application language.It is used particularly in building dynamic pages that are produced in response to specific requests from a visitor. It integrates very well with Apache and is well understood by the vast majority of Systems Administrators.

MySQL is the most popular of the open source relational databases. It has clustering, replication, and a variety of backup solutions.