Figma - Team-based interface design, Figma lets you collaborate on designs in real time.
PreFlight - Preflight is an Automated Web Testing tool. Allows everyone to automate Web UI tests.
Invision - Prototyping and collaboration for design teams
AbTest.io - A free url shortener with A/B testing features
Sketch - Professional digital design for Mac.
Marpipe - Automate Your Ad Testing, Optimize Your Creative