Use this topic to share some knowledge among your fellow Koders about various tools available there which you use or think might be helpful in app development. So, let me start it first.
So, basically Moqups is an online tool which allows users to create wireframes, mockups or UI concepts, prototypes depending on how you like to call them. I personally use it to make a mockup of my app before actually starting its development. It is very easy to use and you can drag-and-drop components to design the mockup of your app.