HTTP Strict Transport Security (HSTS) informs browsers that the site should only be accessed using HTTPS.
Lighttpd is an open-source web server optimised for speed-critical environment.
PayPal is an online payments system that supports online money transfers and serves as an electronic alternative to traditional paper methods like checks and money orders.
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.