Constant Contact is a marketing automation and email marketing solution.
Nginx is a web server that can also be used as a reverse proxy, load balancer, mail proxy and HTTP cache.
NitroPack creates optimised HTML cache for fast page loading experience.
Open Graph is a protocol that is used to integrate any web page into the social graph.
PayPal is an online payments system that supports online money transfers and serves as an electronic alternative to traditional paper methods like checks and money orders.
Priority Hints exposes a mechanism for developers to signal a relative priority for browsers to consider when fetching resources.
Swiper is a JavaScript library that creates modern touch sliders with hardware-accelerated transitions.
WP Engine is a website hosting provider.