Cowboy is a small, fast, modular HTTP server written in Erlang.
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.
Facebook pixel is an analytics tool that allows you to measure the effectiveness of your advertising.
Heroku is a cloud platform as a service (PaaS) supporting several programming languages.
Mailchimp is a marketing automation platform and email marketing service.
React is an open-source JavaScript library for building user interfaces or UI components.
Typekit is an online service which offers a subscription library of fonts.
YouTube is a video sharing service where users can create their own profile, upload videos, watch, like and comment on other videos.