Apache is a free and open-source cross-platform web server software.
Debian is a Linux software which is a free open-source software.
jQuery UI is a collection of GUI widgets, animated visual effects, and themes implemented with jQuery, Cascading Style Sheets, and HTML.
jQuery is a JavaScript library which is a free, open-source software designed to simplify HTML DOM tree traversal and manipulation, as well as event handling, CSS animation, and Ajax.
OpenLayers is an open-source JavaScript library for displaying map data in web browser.