Invision - Prototyping and collaboration for design teams
PreFlight - Preflight is an Automated Web Testing tool. Allows everyone to automate Web UI tests.
Visualtip - A service that allows designers and clients to annotate and collaborate on images in real time
AbTest.io - A free url shortener with A/B testing features
Pastel - Sticky note-based feedback collection tool for live websites
Marpipe - Automate Your Ad Testing, Optimize Your Creative