Useful iPhone apps for architect?

I'm an architect and I'm loolking for some useful apps for my profession could you help me?

Maybe you would like these apps, this list is just for your profession: http://www.apppicker.com/applists/5030/The-best-iPhone-apps-for-architects

Also, you may need those compass apps: http://www.apppicker.com/applists/2569/The-Best-Compass-Apps-for-iPhone-and-iPad

Good day=)

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