AbTest.io - A free url shortener with A/B testing features
Rage Grade by FullStory - Benchmark your customer frustration
GoodUI Evidence - People's A/B test results that show which UI ideas work best
Shuffle for Bootstrap - Bootstrap drag and drop builder for busy developers.
PreFlight - Preflight is an Automated Web Testing tool. Allows everyone to automate Web UI tests.
Tailwind CSS - A utility-first CSS framework for rapidly building custom user interfaces.