cdnjs is a free distributed JS library delivery service.
Disqus is a worldwide blog comment hosting service for web sites and online communities that use a networked platform.
Nginx is a web server that can also be used as a reverse proxy, load balancer, mail proxy and HTTP cache.
Umami is a self-hosted web analytics solution. It's goal is to provide a friendlier, privacy-focused alternative to Google Analytics and a free, open-sourced alternative to paid solutions.