Flawfinder searches through C/C++ source code looking for potential security flaws and produces a report describing the potential flaws found in source code, ranking them by likely severity.
Like RATS, Flawfinder reports are not a direct indication of a vulnerability, but provide a reasonable starting point for performing manual security audits in source code.
Flawfinder can also generate differential reports by pointing it to a patch (diff) file describing the code changes. This way it can be used to determine if the potential flaws found in code have increased or decreased after a commit to a source code management system like CVS or Subversion.
Homepage: http://www.dwheeler.com/flawfinder/