The Amazon Kindle Colorsoft has a seven-inch screen that uses E Ink Kaleido 3 technology. Amazon customized the technology to improve the screen’s contrast, brightness, and speed.
The Boox Note Air 4C is a color e-ink reader, a digital notebook, and an (almost) full-fledged tablet computer in one. It's not a device for everyone, but it's an excellent version of what it is.