Express is a web application framework for Node.js, released as free and open-source software under the MIT License. It is designed for building web applications and APIs.
Heroku is a cloud platform as a service (PaaS) supporting several programming languages.
Intercom Articles is a tool to create, organise and publish help articles.
Nginx is a web server that can also be used as a reverse proxy, load balancer, mail proxy and HTTP cache.
Open Graph is a protocol that is used to integrate any web page into the social graph.