I use Total Launcher, even if it’s not Foss, since it’s the only launcher I found that give me the tools to do anything I want, even in it’s free tier. I never had issues with it. But I hope to find a foss alternative one day.

Ticket Booth. Avaible on Linux. https://github.com/aleiepure/ticketbooth

Automatically fetch data from tmdb. Tag movies / show watched or not. Even episode by episode. I use it and I’m very pleased.