Smaller - Make your websites load faster
Website Speed Ranker - Compare how fast your website loads vs your competitors
Website Grader - Grade your website's strengths and weaknesses in seconds.
Treo - Treo is the page speed monitoring tool that helps your customers from obtaining a faster web experience.
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.
Progressive Tooling - Curated list of tools to improve web page performance