Balsamiq - Balsamiq. Rapid, effective and fun wireframing software.
Slack - A messaging app for teams who see through the Earth!
Invision - Prototyping and collaboration for design teams
Sketchboard.io - Visual Remote Teamwork. Solve problems and create ideas on endless whiteboard with your teammates by sketching.
Zeplin - Collaboration app for UI designers & frontend developers
Smoothboard Air - Smoothboard Air is a collaborative interactive whiteboard application for iPads and Android devices that revolutionizes interaction in lecture rooms.