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.
Parasoft C/C++test - Ensure compliance with a variety of functional safety, security, and coding standards in embedded C/C++ software.
Shellcheck - ShellCheck finds bugs in your shell scripts
Coverity Scan - Find and fix defects in your Java, C/C++ or C# open source project for free
lgtm.com - lgtm.com is a platform for code analytics.
Doxygen - Generate documentation from source code