We have seen many sophisticated keyboards here in the past. The Sonder keyboard is right up there with the best of them. This is an e-ink keyboard that lets you switch between languages, shortcuts, and custom icons quickly. There is no need to memorize shortcuts when you can use this keyboard to display them on your keys. In fact, you can give each key its own icon.
The Sonder keyboard features front lighting, which means you can use it in the dark conveniently. It connects to your computer, tablet, or smartphone via Bluetooth. You can create and share layouts for languages, macros, and widgets for this keyboard. More information on this keyboard is available here.