Apache is a free and open-source cross-platform web server software.
Google Sign-In is a secure authentication system that reduces the burden of login for users, by enabling them to sign in with their Google account.
Iamport is an information technology company based in South Korea.
jQuery CDN is a way to include jQuery in your website without actually downloading and keeping it your website's folder.
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.
Ubuntu is a free and open-source operating system on Linux for the enterprise server, desktop, cloud, and IoT.