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Smaller - Make your websites load faster
Optimage - Advanced image optimization tool
Website Grader - Grade your website's strengths and weaknesses in seconds.
ImageOptim API - Web service for image compression
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.
Imagify - Optimize and resize images online and through your CMS.