Sucuri - Website Protection, Malware Removal, and Blacklist Prevention
Shield Security - The most advanced and easy-to-use WordPress security plugin.
Yoast Plugins - Yoast offers plugins to improve SEO and optimize web sites and blogs.
Virusdie - All-in-One cloud-based, simple, powerful and gorgeous website security tools built for everyone.
WP Rocket - WP Rocket offers a caching plugin for Wordpress.
Acunetix - Audit your website security and web applications for SQL injection, Cross site scripting and other...