The family of Macintosh Operating Systems was developed by Apple Inc. 

Macintosh OS - Components

• Darwin - OS that contains XNU as the kernel
• Aqua UI - closed source
• Cocoa API - closed source

Macintosh OS - Brand Names

General

• launchd - plist
• macOS - Bypass Login Screen
• macOS - Desktop Environment Customizing
• macOS - Dock Not Restarting After killall Dock
• macOS - Finder Display Hidden Files
• macOS - xcode
• System Integrity Protection (SIP)

Personal Projects

• macOS - anti.people
• macOS - auto startup

Package Managers

• fink
• homebrew - brew
• macports