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.
Nginx is a web server that can also be used as a reverse proxy, load balancer, mail proxy and HTTP cache.
SharpSpring is a cloud-based marketing tool that offers customer relationship management, marketing automation, mobile and social marketing, sales team automation, customer service and more, all within one solution.
Silverstripe CMS is a free and open source Content Management System and Framework for creating and maintaining websites and web applications.