Shield Security - The most advanced and easy-to-use WordPress security plugin.
Acunetix - Audit your website security and web applications for SQL injection, Cross site scripting and other...
iThemes Security - Security plugin that provides over 30+ ways to secure and protect your WordPress site.
Horangi - Horangi is a leading cyber-security solution that provides instant response and threat detection for companies who lack the time and expertise to monitor their system.
Defender - Encompassing security solution for WordPress.
PracticeProtect - Network security & identity management