The fact that it says "test" makes me think they are just doing some development on the website. You wouldn't see something like that if they had abandoned the site. It does look like it will be difficult to get hold of the software or any official information on it for now. There is an archive of the site from ~2 weeks ago on the Wayback Machine, but the Glediator section of the site is not archived: http://web.archive.org/web/20190716011951/http://www.solderlab.de/