These files are found within the Achilles Web source code
- index.html - This is the file that is actually loaded when you start your web server
- js/app/achilles.js - This file includes most of the code that actually creates the charts
- OHDSI seems to have created their own wrapper on D3.js to create charts. This is found in js/modules/d3/jnj.chart.js
- They use bootstrap: http://getbootstrap.com/javascript/ components
- You will also notice in the js/ folder that there are many other dependencies. This could be worth exploring more in detail.