iCloud & Apple Services (Apple Ecosystem): open-source projects that exist because someone reverse engineered a closed product, sorted by GitHub stars.
A command-line tool to download photos from iCloud
Unofficial WWDC app for macOS built on Apple's undocumented session content API
Cross-platform unofficial Apple Music client (v1 source)
An Alpine Linux container for the iCloud Photos Downloader command line utility
Dockerized iCloud Client - make a local copy of your iCloud documents and photos, and keep it automatically up-to-date.
Tools to provision Anisette data and talk to Apple servers from Linux without a Mac
Server that generates Apple Anisette (v3) authentication headers for non-Apple platforms
Unofficial documentation of the iTunes Connect JSON API
One-way sync engine for the iCloud Photos Library into the native file system
MITM proxy and documentation for Apple Push Notification Service (APNs) device connections
Rust libraries for Apple's private APIs: GSA authentication, Anisette and developer services
Proof of concept that retrieves iOS 9+ iCloud backups via reverse-engineered CloudKit protocol
Bulk download your iCloud Drive files and folders with a simple command line tool
Mount iCloud Drive on Linux as a fast local-first FUSE filesystem with persistent caching, background hydration, and...
Map viewer for Apple Look Around imagery via its private API
Bidirectional sync of Apple Notes to Markdown on any OS
Library for accessing iCloud in Node.js
FUSE driver for iCloud Drive
Go package for iCloud authentication and icloud.com's unofficial API
Java tool to download iCloud backups using reverse-engineered protocol
Python based iCloud Drive synchronization application
Reverse engineering Apple's geoservices (Maps) network requests