Shield Security - The most advanced and easy-to-use WordPress security plugin.
Defender - Encompassing security solution for WordPress.
Sucuri - Website Protection, Malware Removal, and Blacklist Prevention
WP Hacked Help - WP hacked help is a popular online Wordpress malware removal service.
Imperva Cloud Application Security - Deploy your applications and data where you want. When you want. Imperva keeps them secure in the cloud, on premises, and in hybrid clouds.
Wordfence - Comprehensive security plugin for WordPress.