Apache is a free and open-source cross-platform web server software.
Lightbox is small javascript library used to overlay images on top of the current page.
Mod_dav is an Apache module to provide WebDAV capabilities for your Apache web server. It is an open-source module, provided under an Apache-style license.
PHP is a general-purpose scripting language used for web development.
Prototype is a JavaScript Framework that aims to ease development of web applications.
Unix is a family of multitasking, multiuser computer operating systems.