#6 Ubuntu

Ubuntu is the open-source desktop Linux software developed by British company Canonical. The Ubuntu Touch mobile OS, the new offering from the company strives to be an elegant and immersive gesture-based experience.

It was first spotted on video at CES, and the OS ran on some devices in an attempt to familiarize enthusiasts with Ubuntu mobile.

According to the CNet, Ubuntu Touch, the tablet version of the OS which was unveiled first time at MWC is a complete package. It got lauded for elegant interface that makes use of every side of the screen and puts your content and contacts front and center, minimizing the time spent hopping back to a home screen.

The OS can be installed on the latest Google Nexus devices--Galaxy Nexus, Nexus 4, Nexus 7 and Nexus 10. And according to CNet report developers are working on porting the OS to more devices, including the Asus Transformer series, HTC One handsets, the LG Optimus 4X HD, the Motorola Xoom, the Samsung Galaxy Note and S series, the Nexus S and One, and Sony Xperia phones.

Recently, according to geek.com, an Australian company Intermatix is offering its customers the chance to pre-order the first tablets running the new OS. The two models offered were Intermatix U7 and U10, which sport screens measuring 7 and 10 inches, respectively.

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