Pihole is a big one for me. I also use a firewall on my phone to prevent apps from accessing the network unless I explicitly allow them.

• 2FA: Aegis
• Podcasts: AntennaPod
• Passwords: Bitwarden
• Email: ProtonMail
• Browser: Firefox (and Fennec for Android)
• Search: DuckDuckGo
• Notes: Joplin
• YouTube: Piped (and LibreTube for Android)
• Maps: MagicEarth
• Streaming Music: ViMusic
• File Transfer: Snapdrop and Syncthing
• Messaging: Signal
• VPN: ProtonVPN
• Read It Later: Wallabag

Standard Notes is a big one for me. Thunderbird is the only way I access email on my PC. LibreOffice (or OnlyOffice) is regularly used on my end too. VLC is amazing and the only method I listen to music or watch videos on my devices. JabRef is a phenomenal bibliography tool I use for papers. Plus, Kdenlive is an amazing video + audio editing tool I use to clean up OBS recordings. Lastly, Syncthing is how I manage files across multiple devices. All of these are fantastic and a big aspect of my day to day.

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If I had to choose the top one, it would be self-hosted NextCloud, with a focus on its PhoneTrack plugin and corresponding Android app. Finally a FOSS privacy-friendly way to share my location with my family.

Since nobody mentioned it yet, I want to link to pass.

It uses only standard stuff, passwords are GPG encrypted files in a directory tree, and you can sync them with git. This makes it completely platform/browser independent, I currently use it with passff and APS.

KeePassXC is a solid foss password manager. the encrypted database is stored locally, but also supports sharing with database group export/import

For sharing files with a friend: magic-wormhole