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.
This UBmatrix Processing Engine is an SDK for building XBRL-enabled applications. The engine is the essential component to read, write, and validate XBRL. This project was released under UBmatrix Inc. Learn more about EDGAR Online XBRL Processing Eng
Append hundreds of different XML files into one large data document, validate, and attach a stylesheet. Stitcher is a porwerful summary reporting tool. Allows for complex file storage locations of xml data. UBL, HR-ML, LandXML ... visit stitcher.org.