Open source replacements for (legacy) MS-Windows components

List of Windows components and possible open source counterpart:

• Configuration and maintenance
  • Control Panel
  • Administrative Tools
  • Software installation and deployment
• Applications and utilities
• User interface
• Windows Server
• File systems
• Core components
• Services
• DirectX
• Networking
• Scripting and command-line
• Kernel
• .NET Framework
• Security
• APIs
• Drivers

(source: https://en.wikipedia.org/wiki/List_of_Microsoft_Windows_components)

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