There are 2 repositories under notification-area topic.
STAnd aLONE TRAY (notification area) implementation for X11
🔒 Replace the default KeePass Windows ME–style tray icon with a wireframe padlock icon to match the style of built-in tray icons in Windows 10 and 11.
Clear orphan icons left in the notification-area/system-tray.
Customizable menu for the notification area on windows, using JSON and winforms. A sample menu is generated on the first run. This is an hobby project from 2016 and it's not mantained.
RSS feed reader for the notification area on windows, using cron-like syntax for update intervals. This is an hobby project from 2019 and it's not mantained.