The App Brewery VS HappyCoding

Khan Academy - Khan Academy offers online tools to help students learn about a variety of important school subjects. Tools include videos, practice exercises, and materials for instructors. Read more about Khan Academy.

Xcode - Xcode is Apple’s powerful integrated development environment for creating great apps for Mac, iPhone, and iPad. Xcode 4 includes the Xcode IDE, instruments, iOS Simulator, and the latest Mac OS X and iOS SDKs.

Calcohol - Need to dilute alcohol? How fast water start to boiling?

Appyet - Create stunning Android apps.

Coursera - Build skills with courses, certificates, and degrees online from world-class universities and companies

SwiftUI - SwiftUI is an innovative, exceptionally simple way to build user interfaces across all Apple platforms with the power of Swift.