Cppcheck - Cppcheck is an analysis tool for C/C++ code. It detects the types of bugs that the compilers normally fail to detect. The goal is no false positives. CppCheckDownload cppcheck for free.
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DocFX - A documentation generation tool for API reference and Markdown files!
Coverity Scan - Find and fix defects in your Java, C/C++ or C# open source project for free
NDoc - NDoc generates class library documentation from .