Google Tag Manager is a tag management system (TMS) that allows you to quickly and easily update measurement codes and related code fragments collectively known as tags on your website or mobile app.
HTTP Strict Transport Security (HSTS) informs browsers that the site should only be accessed using HTTPS.
Kong is an open-source API gateway and platform that acts as middleware between compute clients and the API-centric applications.
Tengine is a web server which is based on the Nginx HTTP server.