Apache is a free and open-source cross-platform web server software.
Constant Contact is a marketing automation and email marketing solution.
Open Graph is a protocol that is used to integrate any web page into the social graph.
Priority Hints exposes a mechanism for developers to signal a relative priority for browsers to consider when fetching resources.
reCAPTCHA is a free service from Google that helps protect websites from spam and abuse.
StackPath is a cloud computing and services provider.
Typekit is an online service which offers a subscription library of fonts.
WooCommerce is an open-source ecommerce plugin for WordPress.