EDIT: I’m using Linux.
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I use Reeder on iOS and Mac.
I use FeedMe.
it’s not FOSS.
It would help if you mentioned the ones you tried and what you didn’t like about them, what features you’re looking for, etc. I still haven’t found the perfect client myself.
Fluent Reader. Choose Fever API as a service to use FreshRSS.
what platform?
Linux
I really like Newsflash on Linux. Clean interface, scraping built-in. I also found Feedreader in my repo which looks promising, but I haven’t gotten around to trying it yet.