Boardgent allows you. (To learn how to execute actions, go to the following link).
In the "message" field you can put the text of the notification that you are going to send to the selected devices, the "sound" field is left unchecked in case you do not want the notification to sound with the default sound of the operating system.
Windows (Windows 7 or higher)
Mac - (Mac OS 10.13 or higher)