Swift AI - Artificial intelligence and machine learning library written in Swift.
Wayland - Wayland is intended as a simpler replacement for X, easier to develop and maintain.
Swift Playgrounds - Learn serious code on your iPad in a seriously fun way
Y Window System - Y Window System is a platform that allows you to improve the speed, working, and efficiency of the application in your operating system and helps you to increase the responsiveness of applications similar to any locally based app.
SwiftHub - GitHub iOS client in RxSwift and MVVM-C clean architecture
XQuartz - The XQuartz project is an open-source effort to develop a version of the X.