People who are more into the vi world than I am: are there any other active, still out there vi clones than vim (and things forked from it, like neovim), nvi, and evil for GNU Emacs? I've heard of elvis but it seems relatively moribund (it's not packaged for Debian, for example).
(True classic vi is out there somewhere. I know of vile but I don't think it indents to be a version/clone/etc of vi, just to feel like it.)