Websites to create mockups

Moqups is a versatile web-based design and collaboration tool for creating wireframes, mockups, diagrams, and prototypes, streamlining the design process from concept to handoff. ...more

Balsamiq Mockups is a low-fidelity wireframing tool designed for rapid prototyping and brainstorming. It allows users to quickly create mockups of user interfaces and collaborate on design ideas with a focus on functionality rather than detailed visual design. ...more