Navidrome with Substreamer on mobile for auto-generated recommendations based on already played music works great for me.
Navidrome with Substreamer on mobile for auto-generated recommendations based on already played music works great for me.
Jitsi also provides integration with Matrix chat.
For a less obvious use case, I did some light video editing with Kdenlive and an external monitor, mostly because the Steam Deck is more powerful than my laptop ;)
Also PS2 emulation, Burnout Revenge has not aged one bit and plays very conveniently on a handheld.
Calibre Web has Kobo integration, although I'll admit I haven't been able to make it work so far: https://github.com/janeczku/calibre-web/wiki/Kobo-Integration
Heroic for Epic, Lutris for GoG, this approach worked best for me so far, I ran into issues when trying to run both stores in one application.
Keeping storage and compute separately is the best practice but if you're OK with combining both in one device then running docker-compose on a Synology (via SSH, + versions only) works just fine. An alternative that reduces the lock-in at the expense of more tinkering is buying an amd64 QNAP and installing Openmediavault / TrueNAS / plain Debian.
Logseq can be launched as a desktop app and in a web browser and has both iOS and Android apps. Official sync is a paid feature but there are other options (e.g. Syncthing).