Hi,
the developers of GroIMP recently released a new version (groimp 2.0).
You can find more information and a download link here: GroIMP v 2.0.1 · Grogra / GroIMP · GitLab
As indicated by @gaetanH:
- Please notice that this version requires java 11.
- If you want to start the software as command line you can use java -Xverify:none -jar core.jar