Google Analytics is a free web analytics service that tracks and reports website traffic.
Kong is an open-source API gateway and platform that acts as middleware between compute clients and the API-centric applications.
Open Graph is a protocol that is used to integrate any web page into the social graph.
Ruby on Rails is a server-side web application framework written in Ruby under the MIT License.
A modest JavaScript framework for the HTML you already have.
Stripe offers online payment processing for internet businesses as well as fraud prevention, invoicing and subscription management.