Zeplin - Collaboration app for UI designers & frontend developers
Figma - Team-based interface design, Figma lets you collaborate on designs in real time.
Mightytext - Send & Receive SMS Text Messages from your computer. Sync'd with your Android #
Sketch - Professional digital design for Mac.
Abstract - A secure, version-controlled hub for your design files
Invision - Prototyping and collaboration for design teams