Matt Nedrich writes about the state of testing in Swift and includes information about synchronous and asynchronous testing, UI tests and third party frameworks.
Dan Cutting uses protocols and protocol extensions to create mixins in Swift.
Russ Bishop writes about protocols with associated types and what you get for the extra complexity vs just having protocols with generic type parameters.
Matt Nedrich discovered a really simple way to make your Swift project take at least 12 hours to build. So if you are reading this, while you are waiting for your build to finish, this may interest you.
To quote Chris Lattner: "A truly encyclopedic look at strings in Swift" by Andy Bargh.
Reductio is a tool used to extract keywords and phrases using an implementation of the algorithm TextRank.
Hexacon is a new way to display content in your app like the Apple Watch SpringBoard.
RxBluetoothKit is an Bluetooth library that makes interaction with BLE devices much more pleasant. It's backed by RxSwift and CoreBluetooth.
JASON is a fully tested, well documented JSON deserializer written in Swift that claims to be faster than SwiftyJSON.
Swift Modules is an open and searchable index of Swift Package Manager modules.
Elegant handling of localizable strings in Swift.
Enhance your app / service with a photo editor. It's fully customizable and SDKs are available for iOS, Android and HTML5.