CodeKit - CodeKit allows you to optimize the performance of your website by automatically and efficiently compiling a variety of popular languages.
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.
SiteFlow - The life-saver app for web developers !
Website Grader - Grade your website's strengths and weaknesses in seconds.
Fire.app - Fire.app is a menu bar only app for dead easy HTML prototyping.
Smaller - Make your websites load faster