TypeIt4Me
TypeIt4Me is the original text expander for Mac. Type more quickly and accurately, with fewer keystrokes, using personalised shorthand abbreviations. Available now on an app store near you.
sonorOS
Assign your own sounds to any of 36 common macOS system events. Customize alerts, modifier key presses, mouse clicks, window dragging and a whole lot more.
Juice!
Juice! will warn you when power supply to your MacBook is interrupted and ask you nicely in a polite British voice to plug in when the battery charge drops below a specified level.