Fact extractors for C++:

• AcaCia^?
• ColumbusCAN
• cppx
• TkSeeSN
• vacppparse
• http://www.gccxml.org -- XML output extension to the C++ front-end to GCC. It produces an XML representation of GCC's internal representation.
• YAXX
• Datrix^?
• KLOCwork^?

Related: CppETS