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Website Grader - Grade your website's strengths and weaknesses in seconds.
Virusdie - All-in-One cloud-based, simple, powerful and gorgeous website security tools built for everyone.
Smaller - Make your websites load faster
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.