AlternativeTo is a site I use quite a bit. Personally I use it when I get fed up with an Android app having too many ads / creepy network behavior or want to find a self-hostable version of a freemium service.
It has filters for free, open source, platform type, etc. From my understanding it’s all crowd sourced, so if you disagree with a rating put in a vote! Sharing this in hopes that others find it as useful as I do.
If you know of similar or better resources I would love to hear about them.
Edit: many people are noting that the comments and reviews are out of date. I agree! Despite that I still find it to he useful. It would be great if this little bit of visibility gets more folks engaged over there to improve it.
Thanks for the links, something I have not really thought about. I pretty much assume very low security/privacy on all modern smartphones anyway(commercial or FLOSS ecosystems).
F-Droid is a handy way to find and support devs who are sharing their expertise.
Certainly, use the download-channels that you are comfortable with.
As mentioned on that page, F-Droid and IzzyOnDroid can link you to many decent FLOSS apps. It’s an easy way to be exposed to a large amount of free software.