Tools developed by the Library of Congress and their partners in the National Digital Information Infrastructure and Preservation Program (NDIIPP) for the purpose of validation and transfer of data that conforms to the BagIt specification.
This project has been moved to https://github.com/LibraryOfCongress
The XUL (XML UI Language) project provides free test suites to help ensure interoperability between different XUL motors/browsers and free, open-source show-case examples (aka blue prints) to demo the power of XML for creating UIs.