Its possible you are already using one or more of these… This list comes from Revit Modelling India:

Aconex Mobile Aconex App
As Aconex Mobile app is used for iPads, you can capture photos, audio and videos on project site and access and manage existing project document. It also helps to review the images and drawings as well as view and edit project information offline. Therefore, you are able to sync with the platform, when a connection is available.
BIMxBIMx
BIMx is a free construction app and with this we can turn gadgets into 3D communication as well as presentation tools for the architectural designs.
smartnetbidSmartBidNet
This iPhone construction app makes you able to create and track the bidding procedure with your subcontractors. The accessible info that this app offers make it easier and timelier to bid projects.
construction appWheatland EMT Calc
Wheatland EMT Calc, which helps contractors and engineers, is available for Androids and iPads. For example, with this app, they can canculate the amount they can save on twenty feet of conduit
construction appiBlueprint
iBlueprint is highly useful for real estate agents and contractors, as it has an access to blueprints on job sites. Users can create as well as export custom floor plans with this iPod Touch, iPhone and iPad app.
construction appsArchitect’s Formulator
Architect;s Formulator with over 200 formulas for plumbing, carpentry and electrical calculations goes for $9.99. Besides the excavation and concrete formulas for calculating the bricks and concrete required for a job, this app also have formulas for steel design, parking areas and even swimming pools.
construction appGreen Pro
Green Pro helps engineers, contractors, owners and architects access and follow up leadership in Energy & Design credits for major renovations and new construction projects. With this app, users can access credit requirements and also can find out when a particular requirement has been met.
construction appProcore 
This free construction app makes the users able to create and control punch-list items, access contacts and log time card entries and share and store project pictures. In short, It can make the construction management very easy.
construction appiQuick Contract Maker
This app, which costs $2.99, makes the users able to create and email contracts to customers from iPads, iPhones, or the iPod Touch. With this, the users can also customize contracts for a particular industry or trade.
construction appPlanGrid 
PlanGrid is a free app and it allows the users to put all their project plans, specs and photos on their iPad. Moreover, cloud-founded annotations that instantaneously sync with colleagues is also allowed with this.
construction appUstream Broadcaster
Even though Ustream Broad caster is not a necessary app, it can help the construction industry in many ways. For example, It allows users stream alive from their device, while they are on a job site or looking at properties for future development.
construction appCarpenter’s Helper
As the name indicates, this free app helps the users calculate the stair length, roof pitch and rafter lengths etc.
construction appJobTrac
With this app, you can set up email alert, track jobs, get the advanced bidding news and vies from all over the state.

via
Useful Mobile apps for Construction Professionals

Moustafa Khalil has freely released an Android app and a Revit listener addin that essentially accomplishes a site-to-Revit connection for RFI input into Revit. Essentially, you install the Revit addin, setup the FTP connection, login on the Android app and then take some pictures of RFIs from site. You then add some comments and data to the photo submission, and this is automatically captured into Revit through the FTP site and Revit addin.

Its an interesting approach to this problem. Amazing what someone can accomplish when they think a little outside the box and connect a few different technologies. Nice work.

Download links from Moustafa:
I have uploaded the two applications Mobile and Revit on these 2 sites:
Mobile app: http://a360.co/1yZfNDb
Revit APP: http://a360.co/1vWKFhW

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via SUPER RFI | Architecture For Humanity

Rondo is a company involved in the manufacture and supply of a wide range of lighter gauge roll formed steel products and systems, primarily for the construction industry in Australia, New Zealand, Asia Pacific and the Middle East.

They have released an iPhone / iPad app:

Free to download from the Apple Store to your iPhone and/or iPad, the Rondo App is a practical tool that allows you to;
  • Work out what Rondo products are needed for a project
  • Calculate maximum loads and spans for a wall or ceiling design
  • Determine the most economical Rondo Steel Stud Wall Framing System design possible for a particular layout and the next best solution
  • Estimate what quantity of Rondo products are needed and the pack size they come in
  • Find out the radius required, sweep angle and length of arc for curved designs
  • Email yourself or colleagues a copy of the wall or ceiling design
  • Locate the nearest place to source Rondo products, either by current location using GPS technology or by running a search
  • Simply email your calculated results directly to a Rondo stockist to receive a quote, click to call or get directions using Google maps

The Rondo App is available to download now from the Apple Store on your iPhone/iPad by simply running a search for “Rondo” or by clicking here.

via http://www.rondo.com.au/Corporate/News/ThenewfreeRondoAppforiPhoneiPad.aspx