Q-Stats - Get free marketing insights for every question on Quora.
PreFlight - Preflight is an Automated Web Testing tool. Allows everyone to automate Web UI tests.
Seoxan - check seo report for any website, alexa ranking, server information, meta tags, authority, page speed and more
Marpipe - Automate Your Ad Testing, Optimize Your Creative
HypeStat - HypeStat is free statistics and analytics service, where you can find information about every website.
AbTest.io - A free url shortener with A/B testing features