Apache is a free and open-source cross-platform web server software.
cdnjs is a free distributed JS library delivery service.
D3.js is a JavaScript library for producing dynamic, interactive data visualisations in web browsers.
A multi-dimensional charting library built to work natively with crossfilter and rendered using d3.js
Debian is a Linux software which is a free open-source software.
Google Analytics is a free web analytics service that tracks and reports website traffic.
Open Graph is a protocol that is used to integrate any web page into the social graph.