The Titanium SDK is an open source SDK with more than 634,743 community developers contributing constantly to further enhance and extend it. Independent developers, ISVs, and partners can create Modules to extend the SDK with mobile user interface controls, access to 3rd party services, and leverage any native platform API.
Since using the Titanium SDK, I don’t see the point of developing using native SDKs
Develop native applications for iOS, Android, BlackBerry, Windows, and mobile web through a single code base
Supported by a development community of over 634,743 mobile developers
Why Titanium SDK?