iThemes Security - Security plugin that provides over 30+ ways to secure and protect your WordPress site.
Sucuri - Website Protection, Malware Removal, and Blacklist Prevention
Hide My WP Ghost - Hide My WP Ghost is a WordPress Security plugin. Changes and hides WordPress common paths for the Best WP Security against hacker’s bots. The plugin works like security through obscurity solution for a WP website.
Amazon CloudFront - Amazon CloudFront is a content delivery web service.
CloudFlare - Cloudflare is a global network designed to make everything you connect to the Internet secure, private, fast, and reliable.
Wordfence - Comprehensive security plugin for WordPress.