UPC, a C++ code which can compute the check digit associated with a uniform product code (UPC), or it can report whether a 12-digit UPC is actually valid.
The computer code and data files made available on this web page are distributed under the GNU LGPL license.
UPC is available in a C version and a C++ version and a FORTRAN90 version and a MATLAB version and a Python version.
BANK, a C++ library which can compute the check digit associated with a US Bank Routing Number check digit, or it can report whether a 9-digit code is actually valid.
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LUHN, a C++ program which computes the Luhn check digit for a string, and can validate a string.