(and Atom)
I'm currently using Thunderbird for RSS, subscribing to a small amount of feeds, and filtering heavily. I got tired of having heaps of feed subscriptions, felt like a job that same way social media does.
Not bothering with things you can't host yourself. RSSMix is a popular free service that doesn't seem to be doing anything fishy, but it goes down a bunch.
Planets are a barely-surviving form of web-viewable RSS aggregations. Typically sites would have a 'planet' subdomain, and that page would render results for a number of feeds on a particular topic. Pretty common for Linux and programmery news.
Active planets I've found (and that I find at least half-interesting):
Yahoo Pipes was a web-based GUI thing you could use to (visually) script stuff. I used it to filter and combine various RSS feeds into one. Yahoo shut it down, but here're some similar projects.
For websites that don't have RSS feeds you can use thee tools to generate them:
I assume to encourage you to make an account. In my experience tend to be shit websites I don't want to use! But they have people/things I want to keep track of :(
Arseholes.
https://www.youtube.com/feeds/videos.xml?channel_id=
and searching the page markup for the channel_id
, or grab a browser plugin, etc.