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plausj a collection of checksum algorithms used to validate business keys like bank account codes or credit card numbers. It's compiled as JVM bytecode files (although it's not necessarily implemented in Java) and can be used on JRE 1.5 and later.
A library to check bank account numbers and bankcodes (BLZ) of German Banks. Is not (or no longer) hosted here but instead on ktoblzcheck.sourceforge.net