Syncthing is an amazing decentralized data sharing.
syncthing-notifier show in the systray an icon according to syncthing status and can alert you if someone wants to share something with you.
Left click on the icon to pen syncthing in a browser. Right click on it to see a dialog to close syncthing-notifier.
Clone or download the syncthing-notifier file or the git repository :
https://framagit.org/prx/Sn.Syncthing-notifier
You only need syncthing-notifier file and some libraries installed :
Under debian :
python3-pil python3-tk python3-pil.imagetk tk-tktray
That's it, no need to download icons, they are included in the file. Finally, run ./syncthing-notifier to see notifications.