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ILSpy vs dnSpyEx
dnSpyEx adds a debugger and assembly editor to .NET decompilation, but it is an unofficial fork, GPL-3.0 licensed, and Windows only while ILSpy runs on Windows, macOS and Linux.
ILSpy vs dotPeekA free standalone .NET decompiler and assembly browser from JetBrains, built on ReSharper's decompiler.