cdnjs is a free distributed JS library delivery service.
D3.js is a JavaScript library for producing dynamic, interactive data visualisations in web browsers.
Google Tag Manager is a tag management system (TMS) that allows you to quickly and easily update measurement codes and related code fragments collectively known as tags on your website or mobile app.
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.
Marketo Forms help create web forms without programming knowledge. Forms can reside on Marketo landing pages and also be embedded on any page of website.
Sentry is an open-source platform for workflow productivity, aggregating errors from across the stack in real time.