Apache is a free and open-source cross-platform web server software.
Google PageSpeed is a family of tools designed to help websites performance optimisations.
Leaflet is the open-source JavaScript library for mobile-friendly interactive maps.
MediaWiki is a free and open-source wiki engine.
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.