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Sandcastle
Sandcastle Help File Builder (SHFB). A standalone GUI, Visual Studio integration package, and MSBuild tasks providing full configuration and extensibility for building help files with the Sandcastle tools.
Like already mentioned, use XML comments for everything possible. The class itself, enumerations, methods. In the Build or Compile properties (depends on the version of VS.NET) of your project, enable Generate XML documentation. I then personally use Sandcastle Help File Builder to create a help file from those.
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CodeRabbit
CodeRabbit: AI Code Reviews for Developers. Revolutionize your code reviews with AI. CodeRabbit offers PR summaries, code walkthroughs, 1-click suggestions, and AST-based analysis. Boost productivity and code quality across all major languages with each PR.
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Then use a program (such as docgen) to generate documentation from that.