… is the upcoming implementation of XProc 3.0 developed by <xml-project />.
Like MorganaXProc it is written in Java and runs using JVM. It will be released under GPL.
Current status is late alpha with good results against the XProc 3.0 test suite.
A public beta will be released in late 2019 or early 2020 depending on our progress in working on the specifications.
Stay tuned for progress update on Twitter (@xml_project) or xproc-dev mailing list.