On iOS and macOS, it’s hard to beat NetNewsWire.
On Android, I use Feeder.
On Windows and Linux, go for QuiteRSS.
I’m an RSS newbie, but I need to +1 Feeder. I tried a handful, and it was easily my favourite from the get-go.
I love the “News” addon in nextcloud
The mobile app is quite nice aswell
I know this is the FOSS community but I personally recommend inoreader. It has great usability through its keyboard shortcuts and the ability to pull the full article from the website without clutter (similar to reader add-ons).
If anyone knows a FOSS alternative with similar features, I’d like to know.
Check out NewsFlash https://gitlab.com/news-flash/news_flash_gtk
Newsboat
I am not one of these terminal wizards. I do heck of a lot in the terminal, though. One thing I never thought I’d do in browse RSS feeds.
But, a few years back I was in a situation where my only working computer was a Raspberry Pi so I found myself using Newsboat and I realised the big deal.
For what Plattform?
On a terminal I would recommend newsboat. It has an amazing TUI.