Android
Android is a Linux-based operating system designed for touchscreen smartphones and tablets.
Android Inc. was founded in Palo Alto, California in October, 2003 by Andy Rubin, Nick Sears and Chris White. Google acquired Android Inc. in August, 2005 making it a wholly owned subsidiary of Google. It is currently developed by Google in conjunction with the Open Handset Alliance. Google released the Android code as open source, under the Apache License. There are currently over 700,000 apps available for Android. The first Android-based phone was sold in October 2008 and by 2010 Android was the world’s leading smartphone platform.
iOS
iOS is a mobile operating system developed by Apple Inc. It supports Apple products including iPhone, iPad, iPod Touch and Apple TV.
Windows 7
Windows 7 is an operating system produced by Microsoft for use on personal computers, including laptops, netbooks, tablets and media center PCs.
OS X Mountain Lion
OS X Mountain Lion is Apple Inc.’s desktop and server operating system for Apple’s line of Macintosh computers.