Alternative to Axure interface designer?

Question

css

Hello community!
You need something in which to design the interface. Like Axure Pro, but free. Or paid, but just an alternative.
Mac/Windows/Web - doesn't matter.
Thanks to!
PS
Sketch and the like are already graphic editors. Here the emphasis is on lightness. Indeed, in designing, the main thing is to show the plan, and not its implementation.

Answer 1

Look at pencil.evolus.vn or www.justinmind.com/free

Answer 2

uxpin.com is a pretty good thing, there is a trial.

Answer 3

The Pencil Project is a fun little thing to have fun with, but some things can be done really well.

Answer 4

Adobe XD