Websites that have a shopping cart or checkout page, either using a known ecommerce platform or a custom solution.
Cowboy is a small, fast, modular HTTP server written in Erlang.
DatoCMS is a cloud-based headless Content as a service (CaaS) platform created to work with static websites, mobile apps and server-side applications of any kind.
Heroku is a cloud platform as a service (PaaS) supporting several programming languages.
HTTP Strict Transport Security (HSTS) informs browsers that the site should only be accessed using HTTPS.
Open Graph is a protocol that is used to integrate any web page into the social graph.
Progressive Web Apps (PWAs) are web apps built and enhanced with modern APIs to deliver enhanced capabilities, reliability, and installability while reaching anyone, anywhere, on any device, all with a single codebase.
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.