HTTP Strict Transport Security (HSTS) informs browsers that the site should only be accessed using HTTPS.
Jekyll is a blog-aware, static site generator for personal, project, or organisation sites.
JSDelivr is a free public CDN for open-source projects. It can serve web files directly from the npm registry and GitHub repositories without any configuration.
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.
Plausible is an open-source alternative to Google Analytics.
Twitter Emoji is a set of open-source emoticons and emojis for Twitter, TweetDeck, and also for Android and iOS versions of the application.
YouTube is a video sharing service where users can create their own profile, upload videos, watch, like and comment on other videos.