The current implementation of Grouper uses Ant tasks to build its artifacts, relying on third-party dependencies being supplied along with each submodule. The versions of these jar files are not always clear, as the version is often missing from the filename, and the MANIFEST.MF file is sometimes missing an Implementation-Version property or it is inaccurate. When comparing these files versus official sources (e.g. Maven repositories), some of them are identical to published versions, some are close matches, and some can't be matched to any known version.