Virusdie - All-in-One cloud-based, simple, powerful and gorgeous website security tools built for everyone.
Sucuri - Website Protection, Malware Removal, and Blacklist Prevention
Checkbot - Checkbot will boost the SEO, speed and security of your site by checking you're following 50+ web best practices. Browser extension with free and paid plans.
Wordfence - Comprehensive security plugin for WordPress.
Chaos Toolkit - A chaos engineering toolkit to help you build confidence in your software system
CloudFlare - Cloudflare is a global network designed to make everything you connect to the Internet secure, private, fast, and reliable.