The Swift Programming Language

Commonly used sequence and collection algorithms for Swift

Straightforward, type-safe argument parsing for Swift

Async Algorithms for Swift

The Swift Programming Language book

Commonly used data structures for Swift

This maintains proposals for changes and user-visible enhancements to the Swift Programming Language.

An early experimental general-purpose pattern matching engine for Swift.

The Foundation project

Advanced mathematical types and functions for Swift

Swift.org website

The Package Manager for the Swift Programming Language

Low-level system calls and types for Swift