Shield Security - The most advanced and easy-to-use WordPress security plugin.
iThemes Security - Security plugin that provides over 30+ ways to secure and protect your WordPress site.
Defender - Encompassing security solution for WordPress.
Wordfence - Comprehensive security plugin for WordPress.
WP Hacked Help - WP hacked help is a popular online Wordpress malware removal service.
Acunetix - Audit your website security and web applications for SQL injection, Cross site scripting and other...