Maemo
MeeGo is a Maemo evolution and blends it with Intel’s Moblin software to create an open platform for multiple processor architectures. Applications for MeeGo can be deployed on a range of mobile devices such as mobile computers, netbooks, and tablets
Symbian
Our smartphones are built on Symbian, the world's most proven smartphone platform. It energizes demanding users around the globe, from mid-range to high-end devices. It’s also an ideal ground to develop on thanks to simple, intuitive tools like Qt and WRT.
Series 40
Series 40 is worlds most widely used mobile platform with hundreds of millions of devices in the market. Products built upon Series 40 reach a wide range of price points, and Java ME is a perfect compliment to reach this high volume platform.