DOTKey - 21st century typing for 21st century devices
Pretzel - Keyboard shortcuts for the app you're currently using
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.
KeyCue - Menu shortcuts are supposed to provide quick access to frequently used menu commands.
Image Search Keyboard - Search Google Images right in your keyboard
Alfred - Alfred is an award-winning app for macOS which boosts your efficiency with hotkeys, keywords, text expansion and more. Search your Mac and the web, and be more productive with custom actions to control your Mac.