Apache is a free and open-source cross-platform web server software.
Debian is a Linux software which is a free open-source software.
ASP.NET is an open-source, server-side web-application framework designed for web development to produce dynamic web pages.
Prototype is a JavaScript Framework that aims to ease development of web applications.
YouTube is a video sharing service where users can create their own profile, upload videos, watch, like and comment on other videos.