I don’t really know, why I ever stopped using a feed reader, but I’ve recently got back to it to minimize my online time. In that vein, my static site generator wombat now generates RSS feeds for blogs.
Sadly, Twitter no longer provides RSS feeds itself, but I made a template for drivel, my Twitter CLI, to get around that. It’s useful with the home, mentions and timeline commands.
Lastly, I put some bash glue around youtube-dl, jq and GNU date to generate RSS for YouTube channels or playlists. irq0 correctly mentioned that YouTube provides RSS - but only for channels and only with Flash. Personally, I like the embedded iframe better. youtube-dl does not provide the upload date in playlists so a faux one is created for ordering by playlist position.