Looking for Mockup Software...

Once I used iMockup for sketching screens and dialogs on my iPad but it seems that this software is discontinued or endloop closed its doors. Does anybody know a similar mockup software? I’ve not found any which is so easy to use so it can be used during Meetings.

Balsamiq Mockup works good for me.

+1 for Balsamiq here.
Though I often find “mocking up” a working app in Xojo almost as quick.
Not very practical in a meeting, granted.

On the Windows platform: DesignerVista Mockup

From Google: https://www.google.com/webdesigner/
Another: http://fluidui.com/