Well Known Smart Phone Operating Systems

I did a quick read up  and here is the list of Smart Phone OS according to their market share.

1. Android

• Based On Linux.
• Developed by Android Inc (acquired by Google) . 
• Released by OHSA (Open Hand Set Alliance , comprising of Samsung, Google, Motorola, LG, Intel, Dell, HTC and Sony). 
• Has a unbeatable world wide market share of 70%.
• Popular phones : Samsung Galaxy , LG Optimus, HTC Desire, Motorola Razr and Sony Xperia.

2. iOS

• Based on Unix.
• Developed and released by Apple Inc.
• Has a very good market share of 21%. 
• Popular Phone : Need not say :) It is "The  i Phone ".

3.  BlackBerry 10

• QNX based, which is internally Unix based.
• Developed and released by Blackberry (previously RIM).
• Not so impressive market share of 3%, mostly because of enterprise and business  costumers I guess.
• Popular Phone : Recently released Blackberry 10.

4. Windows Phone

• Developed by Microsoft.
• Most important vendor is Nokia
• 2.5% market share . Sad to see Nokia which used to be biggest player in feature phone reduced to almost 2.5 %.
• Popular Phone: Nokia Lumia

5. Tizen , Firefox and other Linux based OS

• Developed by alliances between Samsung and Intel or by organizations such as Mozilla.
• Trying to provide alternate options to Android.
• 3 % market share altogether.
• Not sure which is very popular phone. 

My two Cents:

1. Most of the Smart phone OS are either Linux or Unix based except for Windows.
2. Android + iOS share 91% market share, and Nokia not doing any of these phones might not help it . Nokia needs  to capture consumers with out of box ideas, else it will have tough time.