#Prototyping.
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Axure RP
Axure RP builds functional UX prototypes with conditions, variables, forms, and responsive views so teams can test complex flows before development.
Balsamiq
Balsamiq is a deliberately rough wireframing tool for early product ideas, user flows, and alignment before visual UI design.
Lunacy
Lunacy is a design tool whose value should be judged in a concrete workflow with clear ownership and review.
Marvel
Design and prototyping platform for wireframes, clickable prototypes, testing, and handoff.
Proto.io
Proto.io builds interactive web and mobile prototypes with UI components, animation, variables, device previews, and controlled review without production code.