Prototyping Tools

Axure
  86
Interactive Wireframing and Prototyping
iRise
  8
Web-based project & requirement management solution
Draftium
  8
Prototyping tool for websites
InVision
  475
Web & mobile app prototype design-to-development platform
Balsamiq
  259
Mockups and Rapid Wireframing Tool
Marvel
  59
Cloud-based prototyping and wirefaming of multi-device apps
Proto.io
  12
Silly-fast mobile prototyping.
Firefly
  2
Design Annotation and Prototyping tool
ProtoShare
  1
Fast. Interactive. Collaborative.
Mockup Tiger
Build wireframes, mockups and prototypes