- Music Player: Music Player
- Notes: Joplin*
- Diary: Diary
- VPN: Riseup VPN is the only decent free one, but it tends to be slow. You can also use Mullvad VPN or iVPN, which are paid.
- Maps: Organic Maps
- Messenger app: If you meen SMS, use QKSMS
- Social media/fediverse frontends: Tusky for Mastodon, Syphon for Matrix, Conversations for XMPP,, Fritter for Twitter, Newpipe for YouTube, Stealth for Reddit, Lemmur for Lemmy, PixelDroid for Pixelfed, and BarInsta for Instagram
- Peertube client: Thorium
- Reminders: Tasks.org
*You need to enable Izzysoft's repo by going to Settings-->Repositories, clicking the plus sign, and then pasting the following link: https://apt.izzysoft.de/fdroid/repo?fingerprint=3BF0D6ABFEAE2F401707B6D966BE743BF0EEE49C2561B9BA39073711F628937A. Also note that PixelDroid has two entries, one of which is on Izzysoft's repo. The one on the main repo is the newer one.