Apache is a free and open-source cross-platform web server software.
FreeBSD is a free and open-source Unix-like operating system.
HTTP Strict Transport Security (HSTS) informs browsers that the site should only be accessed using HTTPS.
OpenSSL is a software library for applications that secure communications over computer networks against eavesdropping or need to identify the party at the other end.
UIKit is the framework used for developing iOS applications.