Yes, there are several open-source tools that can help you adhere to the SOLID principles when writing C# code. Some of the most popular tools include:

1. Resharper: A popular visual studio extension that provides code analysis and refactoring tools to help you write better, cleaner code.
2. StyleCop: A code analysis tool that checks your code against a set of coding standards, including adherence to the SOLID principles.
3. NDepend: A code analysis tool that provides a visual representation of your code's architecture, including suggestions for refactoring to adhere to the SOLID principles.
4. CodeCracker: An open-source code analysis tool that provides real-time feedback on your code as you write it, including suggestions for improving adherence to the SOLID principles.

Please let me know if you would like a more exhaustive list.
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