Envoy is an open-source edge and service proxy, designed for cloud-native applications.
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.
Prismic is a headless CMS for Jamstack.
A modest JavaScript framework for the HTML you already have.
Varnish is a reverse caching proxy.