Silver is a new language front-end for Apple’s new Swift programming language which integrates with Visual Studio and allows developers to code in only one language and output to .Net, Java and Apple’s Cocoa.
The project, by RemObjects, does not mean developers can simply compile iOS apps for Windows Phone, but does mean developers need only to learn one language (like Apple’s supposedly easy Swift one) and apply that knowledge to a number of app frameworks. Presumably also the logic of an app can in some instances remain largely unchanged between different versions of an app for different operating systems.
With developers usually supporting at least 2 and often 3 different operating systems, such tools can be useful in saving time and reducing the cost in manpower, which should help Windows Phone in growing its app library.
Silver will be available as a public preview soon. You can sign up on RemObjects’ website.