I think you can write plugins for Vienna, maybe that would allow you to integrate that service. Fever is mentioned by a (main?) developer in one of the issues

I think you can write plugins for Vienna, maybe that would allow you to integrate that service. Fever is mentioned by a (main?) developer in one of the issues (dated 2013) https://github.com/ViennaRSS/vienna-rss/issues/160#issuecomment-15705208 https://github.com/ViennaRSS/vienna-rss/issues/160#issuecomm...