Balsamiq 


Balsamiq Wireframes is a small but useful graphical tool to sketch out user interfaces for websites and web/desktop/ mobile apps.

Features:

  • Allows to build rough sketches of the prototype for clients.
  • Easy to collaborate and get fast feedback on your wireframes.
  • Replicates the speed and convenience of developing mockups on paper, but also a digital medium.
  • Helps to create simple and static wireframes.

Link: https://balsamiq.com/