Linux

Linux is a Unix-like computer operating system kernel.

Apache

Apache is a free software/open source web server, the most popular in use.

MySQL

MySQL is a multithreaded, multi-user, SQL database management system (DBMS) with more than eleven million installations.

Perl, PHP, or Python

PHP is a reflective programming language originally designed for producing dynamic web pages. PHP is used mainly in server-side application software, but can be used from a command line interface or in standalone graphical applications.