What projects are out there seeking to innovate in the terminal and command line space, and improve or revolutionize the terminal environment?

• NuShell is one such example, a shell that uses structured data in its pipelines. Many other experimental shells out there innovating in different spaces.
• An even more daring example is DomTerm. It's a terminal emulator with more rich rendering. Supports rich text, images, etc while maintaining xterm compatibility.

Please do not shy from answering projects that are very experimental, early stage, break a lot of backwards compatibility or radically change the current way of doing things.