SwordSoft Layout 4+

I came across Swordsoft Layout while looking for wireframing tools in the Mac app store. There aren't too many in here considering the plethora available outside the store like Oversite, Balsamiq, Mockflow….etc.
Since I am mainly using it for website mockups (without the need for team collaboration), Swordsoft Layout did everything I used to do in Mockingbird, and the price represents great value compared to all the other apps which are 5 - 6 times more expensive.
Highly recommended.

This program is amazing, it is so easy to use and produces a great product I was able to mock up a fully functional set of wireframes. I ran into some troubles with a bug with larger files (which is fixed now) and the support they gave me was fantastic.

I downloaded a screen grab program like skitch to do all my graphics mock up and they work seemlessly alongside each other.

Use this program.

Unbelievably quick to create wireframes/mockups. Absolutely love this application. You do not have to be a graphic designer to use it. More than enough UI elements to construct most UIs. It isn't apparent in the screen shots above but it does come with over 50 example mockups. The UI elements are also customisable.