Apache is a free and open-source cross-platform web server software.
cdnjs is a free distributed JS library delivery service.
Modernizr is a JavaScript library that detects the features available in a user's browser.
October is a free, open-source, self-hosted CMS platform based on the Laravel PHP Framework.
PHP is a general-purpose scripting language used for web development.
reCAPTCHA is a free service from Google that helps protect websites from spam and abuse.