One Call Now - One Call Now's message notification delivers automated phone calls, SMS text messages and emails within moments to any group.
MenuBar Stats - Advanced Mac system monitor right from the menu bar
DeskAlerts - Send alerts to any corporate device: PCs, phones, tablets, etc.
iStat Menus - "An advanced Mac system monitor for your menubar."
Sweet Alert - Sweet Alert is a replacement for Javascipt's "Alert".
Stats - Simple macOS system monitor in your menu bar.