Balsamiq - Balsamiq. Rapid, effective and fun wireframing software.
Figma - Team-based interface design, Figma lets you collaborate on designs in real time.
Invision - Prototyping and collaboration for design teams
Zeplin - Collaboration app for UI designers & frontend developers
Sketch - Professional digital design for Mac.
ProtoPie - ProtoPie is the easiest tool used to turn your UI/UX design ideas into highly interactive prototypes for mobile, desktop, web, all the way to IoT.