PreFlight - Preflight is an Automated Web Testing tool. Allows everyone to automate Web UI tests.
Edit Any Webpage - Edit any site on the fly - bookmarklet
AbTest.io - A free url shortener with A/B testing features
Jam - Portable bluetooth speakers that set you and your jams free. Wireless speakers, great sound quality, and totally portable, need we say more?
Marpipe - Automate Your Ad Testing, Optimize Your Creative
Iteration X - Iteration X allows teams to annotate and edit any live website or web app directly in Chrome.