What are your favorite alternative FOSS apps that are better than the app you switched from?

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The original was posted on /r/fossdroid by /u/LW_owl on 2024-09-07 20:32:47+00:00.

I'm talking about FOSS apps that are better and/or more feature-rich than the apps previously used.

Reply with the apps you used and their FOSS alternatives if you can (: