Dear Stefan,
tdeio-gopher is available through Gitea (https://mirror.git.trinitydesktop.org/gitea/TDE/tdeio-gopher) but it's probably not packaged for Devuan/Debian. I built it from source from there.
Once installed, you can access any URL that begins with gopher:// through Konqueror (and most other TDE applications I suppose), its contents will be displayed in a folders/files structure like any ordinary folder.
-- Mavridis Philippe