VirtualBuddy is a macOS-native virtual machine manager built on Apple's Virtualization framework. It allows developers to create, configure, run, and manage macOS and Linux virtual machines on Apple Silicon hardware, primarily for testing applications across different macOS versions. The system provides a full SwiftUI/AppKit GUI, a command-line tool (vctool), an XPC service for device restoration, and a guest application that runs inside VMs for clipboard sharing, file transfers, and configuration import. It manages the complete VM lifecycle: provisioning from IPSW restore images or Linux ISOs, hardware configuration (CPU, memory, storage, network, USB passthrough), boot/pause/resume, saved session save/restore with atomic file operations, and enterprise managed preferences via MDM. The architecture is modular with separate frameworks (VirtualCore, VirtualUI, VirtualWormhole, DeepLinkSecurity, VirtualInstallation) and a clear separation between UI, logic, and communication layers. External dependencies include Sparkle for updates, VMBridge for guest-host communication, and Apple's private MobileDevice framework for device restoration. The codebase exhibits high craftsmanship with well-structured concurrency (async/await, actors, Combine), extensive use of SwiftUI patterns, and robust state machines for session lifecycle and installation. However, heavy reliance on private Apple APIs and version-conditional compilation introduces medium technical drift risk, and the overall complexity is significant.

This repository builds 'WWDC', an unofficial macOS application for browsing, searching, and playing WWDC session videos. It provides a native experience with features like video playback via a custom PlayerUI framework, transcript viewing with full-text search, session scheduling, bookmarks, favorites, iCloud sync via CloudKit, and video downloading. The architecture is modular, comprising main app target with embedded frameworks (PlayerUI, ConfUIFoundation, ConfCore), an XPC service for transcript indexing, and a Swift package for transcript handling. Data flows from Apple's WWDC API through a sync engine into a local Realm database, with UI built using AppKit and SwiftUI, heavy use of Combine for reactive updates, and Sparkle for auto-updates. While primarily an application, it also includes JSON fixtures and test data for transcript processing, giving it a minor hybrid character.