Android and iOS may be at the top of the heap in the smartphone world, but that hasn't stopped competitors, new and old, from trying to grab a piece of the pie. Ubuntu-maker Canonical announced Wednesday that it would enter the smartphone fray with its own Ubuntu phone OS
based loosely on its popular Linux distribution for PCs. Research in Motion at the end of January will announce availability for BlackBerry 10
, widely acknowledged as the company's last chance to retain any competitive advantage in the smartphone wars. Meanwhile, Microsoft is pushing Windows Phone 8, hoping that it unseats BlackBerry to become the third most popular smartphone OS behind Android and iOS. And the Mozilla Foundation also hopes to crack the smartphone world with a Web-based smartphone.