Ubersuggest - Want more traffic? Ubersuggest shows you how to win the game of SEO. Just type in a domain or a keyword to get started.
Decidr - Make better decisions with quick A/B polls
Keyword Explorer by Moz - Find the best keywords to improve your website's SEO traffic
GoodUI Evidence - People's A/B test results that show which UI ideas work best
Keyword Surfer - Get search volumes & keyword data directly in Google.
PreFlight - Preflight is an Automated Web Testing tool. Allows everyone to automate Web UI tests.