In case you didn't know, there's a development kit available for the Samsung's new Bada OS. The toolset is free for download and is available to anyone willing to make his own addition to the software. The SDK includes APIs, a user interface tool, a simulator, a debugger, and other tools developers can use to create applications for Bada. First Bada-powered phones will start selling outside of U.
Sony Ericsson has released the SDK for its upcomig Xperia X1 handset. While it sounds like it won't have any difference from the Windows Mobile 6.1 SDK, this kit will allow developers to create custom interactive panels for the X1’s UI. Later the manufacturer also plans to launch a panel download service, a little similar to the AppStore.
According to Apple, 3rd party application developers will be able to use the original tools for creating games and apps for the iPhone.
The best of them will be available for download through the new iTunes Applications Store, PC, as well as EDGE or Wi-Fi. The beta version of the SDK is already available, but it will only be supported after the firmware update 2.
Apparently, Google plans to release a new Android SDK in a couple of weeks, and according to the review at Reg Developer, the updated kit should be more functional than the previous one, and will also include a new user interface.