Apache is a free and open-source cross-platform web server software.
Mod_python is an Apache HTTP Server module that integrates the Python programming language with the server. It is intended to provide a Python language binding for the Apache HTTP Server.
PHP is a general-purpose scripting language used for web development.
Python is an interpreted and general-purpose programming language.
Ubuntu is a free and open-source operating system on Linux for the enterprise server, desktop, cloud, and IoT.