Jesse Squires ran into some issues with protocols and @objc when updating a project to Swift 2.2. In this article he explains how you can avoid the overuse of @objc.
Roopesh Chander uses protocols to build a responder chain with pure Swift, that does not need any dynamic features.
Erica Sadun writes about the additions to sequences in SE-0094 and shows what's possible with those changes.
Erica Sadun was asked what the biggest/best change in Swift 3 is and she gives her answer in this article.
Marco writes about using Swift protocols to separate POSIX socket functionality.
Blazing fast Markdown rendering in Swift, built upon cmark.
The principles of object-oriented design in Swift 2.2.
Daniel Steinberg gave a talk about Swift's history from its beginning to the present at this year's UIKonf.
Sam Soffes gave a talk about simpler tables with values, enums & protocols a while ago. The video of his presentation has finally been released.
A Hopper plugin for demangling Swift symbols.
Enhance your app / service with a photo editor. It's fully customizable and SDKs are available for iOS, Android and HTML5.