6 Apps you must try

1. Google Goggles

Google eventually wants the app to be a universal visual search tool. But Goggles is still in development (a fact that Google stresses), and identifying all sorts of stuff by snapshot alone is a major challenge.
For now, Google emphasizes that Goggles works its magic best on iconic sights, such as landmarks, book covers, bar codes, wine bottle labels, corporate logos and artwork. But the company is working on increasing the accuracy of Goggles. Keep reading to learn more about how Goggles might help you see -- and search -- your world with a fresh set of eyes.

Platform: Android, iOS 4.0
Price: Free

 2. Acrossair

This is the app for you whether you are interested in brushing up on your general knowledge or are keen to learn about your surroundings in a fun interactive way.

Ever walked past a building and wanted to know more? Diminish your unknown with the nearest wiki!

Holding the phone vertically gives you an AR view, with a synopsis against points of interest near you. Tapping on the place you wish to learn more about will give you more in-depth information on the location with images.

Platform: iOS
Price: Free

 3. iOnRoad Augmented driving lite

Bringing to the Android Market what I consider one of the only useful augmented reality apps in existence, iOnRoad has introduced iOnRoad Augmented Driving. This app utilizes your Android device's rear camera to have a look at traffic in front of you, and, using complex visual algorithms, it determines headway, speed, direction, and potential traffic threats.

 What's more, the app still keeps watching, and keeps you abreast of any potential dangers while running in the background, meaning you can switch to your music player, messaging app, or phone, and still get alerts from iOnRoad.

On top of its incredible safety features, the apps also offers social integration, allowing you to unlock (and compete for) driving achievements (which seem to be geared toward safe driving), and upload snapshots of interesting sights, reckless drivers, etc. to Facebook.

One last thing - you can set iOnRoad to automatically detect when you start driving, thereby starting the video feed and your augmented driving experience

Platform: Android, iOS
Price: Free

 4. Theodolite

Theodolite is a multi-function augmented reality app that combines a compass, GPS, map, photo/movie camera, rangefinder, and two-axis inclinometer. Theodolite overlays real time information about position, altitude, bearing, range, and inclination on the iPhone’s live camera image, like an electronic viewfinder.

Uses are endless, and Theodolite is great for outdoor sports, hiking, boating, hunting, golf, sightseeing, photography, and navigation. The app is used in the field every day by surveyors, geologists, architects, engineers, military personnel, competitive sportsmen, and search and rescue workers.

Theodolite set a new standard for augmented reality navigation apps when it debuted in 2009. It has been featured numerous times in iTunes (including honors as a "Rewind 2010" app), and has been the #1 selling Navigation app in iTunes stores around the world.

Platform: iOS
Price: $ 3.99

 5. TagWhat

Tagwhat is the most comprehensive feed of hyperlocal content in the world. Its award-winning mobile apps instantly find and deliver actionable content about the places around you. Tagwhat delivers the right content to the right people at the right time so that you never miss what’s happening nearby again.
Tagwhat makes it extremely easy for businesses to tether their digital content to real-world locations and deliver it to nearby mobile users.

 Platform: iOS, Android
 Price: Free

6. Color blindness simulator

So you have a friend who is colorblind... how does the world look to him/her? With this app, you can see what it is like to be red, green or blue color blind. If you are colorblind yourself, you can also correct it - but first check which type of colorblindness you have by seeing whether you can tell the difference to the normal view.
This application simulates and corrects color blindness in real-time using the integrated camera of your phone - so it is also a simple augmented reality application. All common colorblindness types are supported, it is also possible to compare with normal vision.So if you have a friend with color blindness so help him see the
world with your smartphone.

Platform:Android
Price: Free