Open XLIFF Filters is an open source set of Java filters for creating and merging XLIFF 1.2 and 2.0 files. Source code is hosted in GitHub at https://github.com/rmraya/OpenXLIFF. Ready to use binaries for Windows, Linux and macOS are available in this web site, at Open XLIFF Filters and Downloads.
With Open XLIFF Filters you can create XLIFF files that don't use proprietary markup and are compatible with most Computer Assisted Translation (CAT) tools.
XLIFF Manager on Windows 10