Swift is a powerful and intuitive programming language for macOS, iOS, watchOS, tvOS, and beyond. It's designed to give developers more freedom than ever. Swift is easy to use and open source, so anyone with an idea can create something incredible.
CodePlex is a Microsoft-hosted open source project hosting site. It provides a platform for developers to share and collaborate on code, manage and track work items, and access a wide range of tools to help build and maintain their projects.