#5 Sailfish
Jolla Mobile in many sources is an independent Finland-based designer, developer and seller of Smartphones. The company has developed Sailfish OS based on the core distribution of the Mer project, which continues the previous work of the MeeGo project.
Jolla continues the work started by Nokia that produced the Nokia N9 with the MeeGo version Harmattan. After Nokia abandoned their participation in the MeeGo project in favour of Windows Phone, the directors and core professionals from Nokia's N9 team left the company and formed Jolla, to bring a successor to MeeGo back to the mainstream market.
Sailfish includes a multi-tasking user interface that Jolla intends to use to differentiate its Smartphones from others and as a competitive advantage against devices that run Google's Android or Apple's iOS.
#4 Open WebOS
Open Web OS is a mobile operating system based on a Linux kernel, initially developed by Palm, which was later acquired by Hewlett-Packard and then LG Electronics.
Back in January 2009, Palm stole the show at CES by showcasing its brand new and surprisingly good-looking mobile operating system called webOS. But the Palm Pre and later models failed to catch the attention of potential buyers, leaving the company in a bad shape.
Various versions of WebOS have been featured on several devices, including Pre, Pixi, and Veer phones and the HP TouchPad tablet. HP made the platform open source, and it became Open WebOS, but Palm kept it as a walled OS till then.
Though LG said that it is planning to include the OS in its smart TV range of devices and other consumer electronics, but there’s possibility of eventually producing a phone or other mobile devices that run webOS.
#3 BlackBerry 10 OS
BlackBerry 10 OS is the latest offering from BlackBerry Ltd (it was Research In Motion previously), and it got shipped with the company’s flagship phone ‘BlackBerry 10.”
The features shown off at the BlackBerry World conference included a unique platform-wide flow interface, a new intelligent keyboard, as well as a camera app which allows the user to adjust the photo or individual faces by moving through time scale to optimize picture quality (it gave the time machine feel to the users)
The user interface also includes the ability to run 8 "Active Frames". Active Frames are applications that are currently running within the operating system, but minimized and showing a feed of live information on the home screen. The Operating System also features the 'Hub', a list accessible from anywhere in the OS where all notifications including emails, social networking sites and text messages in one complete list.
#2 Windows Phone 8
Windows Phone 8 is the second generation of the Windows Phone mobile operating system from Microsoft. It was released on October 29th, 2012, and like its predecessor, it features the interface known as Metro (or Modern UI).
Windows Phone 8 replaces its CE-based architecture used on Windows Phone 7 devices with the Windows NT kernel found on many Windows 8 components. Current Windows Phone 7.x devices cannot run or update to Windows Phone 8 and new applications compiled specifically for Windows Phone 8 are not made available for Windows Phone 7.x devices.
The OS is also having bevy of apps recently. A couple of days ago the Instagram icon was spotted on a Nokia Lumia 620 promotion banner, stirring up expectations near and far.
Windows Phone 8 devices are manufactured by Nokia, HTC, Samsung and Huawei, and are hot favorites with the consumers.
#1 Series 40
Series 40 is a mobile platform and application user interface (UI) software on Nokia's broad range of mid-tier feature phones, as well as on some of the Vertu line of luxury phones. It is one of the world's most widely used mobile phone platforms and found in hundreds of millions of devices. Nokia announced the platform on 25 January 2012 that the company has sold over 1.5 billion Series 40 devices. S40 has more features than the Series 30, which is a very basic OS. They are not used for smartphones, in which Nokia primarily uses Windows Phone, and up until 2012 Symbian. However, in 2012 and 2013, several Series 40 phones from the Asha line, such as the 308, 309 and 311, have been classified as "smartphones".
Jolla Mobile released the first software developer kit for Sailfish and started showing off the operating system at Mobile World Congress in Spain.
#8 Tizen
#2 Microsoft
#1 Google
#3 Infosys
Bharat Heavy Electricals Limited is an Indian state-owned integrated power plant equipment manufacturer, and operates as engineering and manufacturing company. It is based in New Delhi.
#6 Facebook
#5 IBM