Tizen alternatives

Tizen is an open and flexible operating system built from the ground up to address the needs of all stakeholders of the mobile and connected device ecosystem, including device manufacturers, mobile operators, application developers and independent software vendors (ISVs). Tizen is developed by a community of developers, under open source governance, and is open to all members who wish to participate.
Tizen alternatives are:
Android, iOS, Samsung bada
Here are the latest news about Tizen:

2015 Samsung launched its first Tizen phone

Samsung finally released its first phone powered by the Tizen operating system - Samsung Z1. Initially it will be available in India for $92. Tizen has long been touted as Samsung’s attempt to hedge its reliance on Google and Android, although this first incarnation of the operating system will not compete with its high-end devices in any way. Instead it appears complementary to Samsung’s mid-range devices — that now includes the Galaxy A7, which launched this week — and it could have potential in price-sensitive emerging markets. Z1 can't run Android apps as was suggested before. Samsung already pledged to put Tizen on its new smart TVs this year and positions it as its platform for IoT devices.