Cloudflare
This extension speaks with Cloudflare API so you can easily control Cloudflare cache from WordPress.
Heartbeat
Heartbeat extension allows you to manage the frequency of the WordPress Heartbeat API.
Varnish (Premium Exclusive)
Automatically purge Varnish Cache when content on your site is modified.
Google Tracking (Premium Exclusive)
Host google scripts on your server to help satisfy the PageSpeed recommendation for leverage browser caching.
Facebook Tracking (Premium Exclusive)
Host facebook scripts on your server to help satisfy the PageSpeed recommendation for leverage browser caching.