Google Earth fly around the planet with a swipe of your finger. Explore distant lands or reacquaint yourself with your childhood home. Search for cities, places, and businesses. By Google, Inc.

The free Merriam-Webster dictionary app brings America’s most useful and respected dictionary to your iPhone. A great tool for reference, education, and vocabulary building. By Merriam-Webster, Inc.

NIST standard reference materials mobile supplies industry, academia, government, and other users with over 1200 reference materials of the highest quality and metrological value. Mobile-friendly web interface. By U.S. NIST.

Wikipedia mobile is the free encyclopedia containing more than 20 million articles in 280 languages, and is the most comprehensive and widely used reference work humans have ever compiled.

WolframAlpha is the free encyclopedia containing more than 20 million articles in 280 languages, and is the most comprehensive and widely used reference work humans have ever compiled. By Wolfram Group LLC.