iThemes Security - Security plugin that provides over 30+ ways to secure and protect your WordPress site.
Shield Security - The most advanced and easy-to-use WordPress security plugin.
Wordfence - Comprehensive security plugin for WordPress.
Defender - Encompassing security solution for WordPress.
WP Hacked Help - WP hacked help is a popular online Wordpress malware removal service.
HackerOne - HackerOne provides a platform designed to streamline vulnerability coordination and bug bounty program by enlisting hackers.