InSili.co has launched ObjCConverter for Swift for the Mac App Store. ObjCConverter for Swift (previously known as iSwift) offers automatic as-you-type conversion of your Objective-C sources to Apple’s Swift language along with a full-featured Objective-C editor.
It allows you to convert and translate your existing Objective-C files — Cocoa or iOS — to Swift on the fly. ObjCConverter for Swift/iSwift 2.4 is available for $14.99 at the Mac App Store (http://tinyurl.com/z9aa93q). It requires Mac OS X 10.7 or higher.