Apple

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

Automated tests for validating the generated Swift snapshots behave correctly

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

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

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

The Package Manager for the Swift Programming Language

The Swift Programming Language

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

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

Turi Create simplifies the development of custom machine learning models.

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

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

HTTP/2 support for SwiftNIO

Bindings to OpenSSL-compatible libraries for TLS support in SwiftNIO

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

Stress testing utilities for Swift's tooling

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

Swift Community-Hosted Continuous Integration

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

Official CUPS Sources

Useful code around SwiftNIO.

Plugin and runtime library for using protobuf with Swift

Converter tools for Core ML.

The Calendar and Contacts Server.

The Darwin Kernel (mirror)