StackPath - Secure Content Delivery Network, DDoS, WAF Service
Website Grader - Grade your website's strengths and weaknesses in seconds.
Avast - Avast security software products are developed for Microsoft Windows, Mac OS X, Android and Linux users by AVAST Software.
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.
Flexera Software Vulnerability Manager - Flexera Software Vulnerability Manager provides solutions to continuously track, identify and remediate vulnerable applications.
PageSpeed Ninja - One-click page speed boost for WordPress