AutoHotkey Community

Probably the best open source tray minimizer tool there is. You don't have to press any extra hotkey to minimize or show the window. Just minimizing the window as you would do normally. The program detects window events and will minimize it to tray if the window title matches, as if the third-party software supports it.

https://minimize-to-tray.sourceforge.io/Minimize2Tray.html