F-droid has a lot of interesting apps. I know it looks old, if you want, download #Droidify that has a more elegant interface.

Recomended apps from F-droid:

- Moshidon: For mastodon
- Localsend: For share files between local devices
- Newpipe: Player for youtube and peertube
- K9-mail or thunderbird: Email client
- Keyboards, maps, chat client and more. All of them open source :)
@lps