I friend has an idea for an app and want to do some mock ups of the gui screens.
It is basically going to be like a forum/news type app so there will only be text, pictures, icons, but they need to be able to draw out the layout etc.
Is there a good free piece of software for doing this?
Thanks in advance
She just needs the screenshots just to show what the screens on the app end product should look like, it doesn't need to have any functionality, she just needs to be able to add chop and change buttons fonts, colours, borders, shading, location of text/pictures etc.