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24 of the best free alternatives to the most popular paid software
(www.xda-developers.com)
This is a most excellent place for technology news and articles.
I recommend Okular for PDF reading. No ads, no upsells, no BS. It also has native dark mode
Gwenview has always worked well for me.
I like Atril too. It has easier and more fluid zoom in/out capabilities than Okular but Okular has a dark mode. I keep both installed because they're both really good.