9 Upvotes
CourseBuffet Find and compare hundreds of free online courses
Opinion Stage Engage Your Audience
Page load time Displays page load time in the toolbar
Poper Blocker Blocks popups and popunders everywhere.
Sprout Social Create an Exceptional Experience Across Social Networks
MozCast The Google Algorithm Weather Report
Pingdom Everything you need for website monitoring
Yoast SEO Plugin Increase your WordPress site visitors!
Google AdWords Keyword Planner Search for new keyword or ad group ideas