Apple

The Swift Programming Language

The XCTest Project, A Swift core library for providing unit test support

Turi Create simplifies the development of custom machine learning models.

This is the version of LLDB that supports the Swift programming language & REPL.

Useful code around SwiftNIO.

FoundationDB - the open source, distributed, transactional key-value store

The libdispatch Project, (a.k.a. Grand Central Dispatch), for concurrency on multicore hardware

Extensions for SwiftNIO to support Apple platforms as first-class citizens.

Official CUPS Sources

A Logging API package for Swift 5.

Plugin and runtime library for using protobuf with Swift

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

The Foundation Project, providing core utilities, internationalization, and OS independence

The Package Manager for the Swift Programming Language

Event-driven network application framework for high performance protocol servers & clients, non-blocking.

The infrastructure and project index comprising the Swift source compatibility suite.

Automated tests for validating the generated Swift snapshots behave correctly

A low-level build system, used by Xcode and the Swift Package Manager

Index database library for use with sourcekit-lsp

SwiftPM package for SwiftSyntax library.

Logging and communication to allow Swift toolchains to communicate with Xcode.

Language Server Protocol implementation for Swift and C-based languages

Stress testing utilities for Swift's tooling

HTTP/2 support for SwiftNIO