Apache is a free and open-source cross-platform web server software.
MODX (originally MODx) is an open source content management system and web application framework for publishing content on the World Wide Web and intranets.
PayPal is an online payments system that supports online money transfers and serves as an electronic alternative to traditional paper methods like checks and money orders.
PHP is a general-purpose scripting language used for web development.
YouTube is a video sharing service where users can create their own profile, upload videos, watch, like and comment on other videos.