TouchBar for your old MacBook - Use Touch Bar on an iPad through USB connection
DOTKey - 21st century typing for 21st century devices
Haptic Touch Bar - The missing haptic feedback for Touch Bar keys
Logitech Bluetooth Multi-Device Keyboard K480 - Whilst the keyboard functionality itself is quite basic, the ease with which you can switch between devices, and the added cradle for supporting tablet and/or phone make this a useful keyboard for anyone wanting one keyboard to rule them all.
Touch Bar Simulator - The macOS Touch Bar Simulator as a standalone app
Image Search Keyboard - Search Google Images right in your keyboard