Silver lets developers use a common language across multiple platforms, but it is not a cross-platform technology
Swift, Apple's new language for iOS and OS X application development, will be extended to the Microsoft .Net and Google Android platforms via a free third-party implementation called Silver.
Built by RemObjects Software, Silver enables developers to write code directly against .Net, Java, Android, and APIs, the Silver Web page says.
Silver, which moved a general beta stage a couple weeks ago, serves as a
native compiler for its supported platforms, and non-UI code can be
shared between platforms.
