Website Grader - Grade your website's strengths and weaknesses in seconds.
Smaller - Make your websites load faster
Treo - Treo is the page speed monitoring tool that helps your customers from obtaining a faster web experience.
Website Speed Ranker - Compare how fast your website loads vs your competitors
Hyperping - Cheap uptime and performance monitoring with detailed reporting and flexible alerting
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.