This is Fluent Reader.<p><i>Note</i> the page only advertises downloads for Windows and Mac; however, on the releases page[1], an *.AppImage for Linux can be downloaded.<p>Testing it right, it does look nice. Maybe finally time to retire FeedBro which just has too many bugs to be called good software.<p>[1](<a href="https://github.com/yang991178/fluent-reader/releases">https://github.com/yang991178/fluent-reader/releases</a>)