Swift continues to grow as a language both in terms of community and the language itself even in places outside of Macs, iPhone, iPads, Apple Watches, and Apple TVs. If you’re interested in learning about Swift, here is an updated list of resources:

Sections

Official Resources (i.e. Apple)

Apple Developer

https://developer.apple.com/swift/resources/

Apple Open Source Swift Community

https://swift.org/community/

Apple Swift Blog

https://developer.apple.com/swift/blog/

Developer Forums

https://developer.apple.com/devforums/

WWDC Tutorial Videos

https://developer.apple.com/videos/wwdc2015/

Swift Source

https://github.com/apple/swift

Swift Future Proposals

https://github.com/apple/swift-evolution

Other Swift Repos

https://github.com/apple

Blogs, Tutorials and Apps

Ray Wenderlich - Swift Tutorials

https://www.raywenderlich.com/category/swift

TutsPlus - Swift Tutorials

http://code.tutsplus.com/categories/swift

Medium - Swift Programming

https://medium.com/swift-programming

Swift@IBM

https://developer.ibm.com/swift/

Thinkster Resources

https://thinkster.io/a-better-way-to-learn-swift

Swifty App

https://hellocode.io/swifty/

Swift Summit 2015 Videos

https://www.swiftsummit.com/#portfolio-container

We ❤ Swift Blog

https://www.weheartswift.com

Blog Posts

Welcoming our new Swift 2.2 Overlords - Erica Sadun

http://ericasadun.com/2016/01/26/welcoming-our-new-swift-2-2-overlords/

List of upcoming list changes to Swift.

Hipster Swift: Demystifying The Mysterious

http://krakendev.io/blog/hipster-swift

There are a lot of features in Swift that not many people use, but I know that one day I'm going to come across something weird and end up Googling what something is.

15 Tips to Become a Better Swift Developer

http://savvyapps.com/blog/swift-tips-for-developers

Below we’ve outlined some of the Swift tips we've learned throughout our experience using this new language. They've helped us code more cleanly while aiding developers who are more familiar with Objective-C acclimate to Swift better. We’ve provided tips for various backgrounds and experience with Swift. Head to the relevant section and enjoy.

Mailing Lists and Online Communities

swiftmonthly

http://swiftmonthly.com

sososwift

http://www.sososwift.com

Reddit

https://www.reddit.com/r/swift

Other Swift Resource Lists

LearnSwift Tips

http://www.learnswift.tips

A list of links organized into friendly lessons.

awesome-swift

https://github.com/Wolg/awesome-swift

A curated list of awesome Swift frameworks, libraries and software.