[lake99]

There is Acme for Plan9 [1] and it has inspired a few other editors. I don't use them myself because they don't have syntax highlighting.

[1]: demo at http://www.youtube.com/watch?v=dP1xVpMPn8M

[symmetricsaurus]

That looks awesome. Having used the WMII window manager it looks quite familiar. Even then the learning curve seems steep.