The market share of Nokia (NYSE: NOK)'s Symbian, once the most shipped operating system, continue to plummet. It's down by as much 62.9%, from 16.9%. According to IDC, market share in the second quarter of 2011 to just 4.4% in the same period this year.

Yesterday, Nokia announced that it will sell some of its 500 wireless patent to Vringo (NYSE Amex: VRNG), a U.S.-based company that provides software platforms for mobile social and video services.

Nokia will also divest its Qt software business to Digia Oyj, a Finnish IT services firm. Analysts say that it will sell the software, a cross-platform development framework, for just a fraction of what it paid to Trolltech back in 2008, a deal that cost the company $150m.

More or less that 125 employees from Nokia will move to Digia as part of the deal. The firm said it plans to make the software, used by 450, 000 developers, available for Apple's iOS, Google's Android and Microsfot's Windows 8.

The software used to be a central part of Nokia's strategy, until it ditched the Symbian for Microsoft's Windows Phone, for its flagship smartphone devices like the Lumia series, in 2011. Nokia’s decision accelerated Symbian’s decline.