It looks like Geosetter has not been abandoned. There's a minor update to 3.5.2 (https://geosetter.de/en/2019/10/20/minor-update-after-long-time-en/). It just fixes a problem with requesting names from GeoNames that had special characters.
The Mantis error tracker (https://geosetter.de/mantis/my_view_page.php) is also back up and running.
good to hear, thanks for the information!