Discuz! X is an internet forum software written in PHP and supports MySQL and PostgreSQL databases.
HTTP Strict Transport Security (HSTS) informs browsers that the site should only be accessed using HTTPS.
jQuery is a JavaScript library which is a free, open-source software designed to simplify HTML DOM tree traversal and manipulation, as well as event handling, CSS animation, and Ajax.
Tengine is a web server which is based on the Nginx HTTP server.