Shield Security - The most advanced and easy-to-use WordPress security plugin.
Sucuri - Website Protection, Malware Removal, and Blacklist Prevention
Defender - Encompassing security solution for WordPress.
Amazon CloudFront - Amazon CloudFront is a content delivery web service.
WP Hacked Help - WP hacked help is a popular online Wordpress malware removal service.
CloudFlare - Cloudflare is a global network designed to make everything you connect to the Internet secure, private, fast, and reliable.