This is too much. I've never seen an editor that runs well on the 3 of them. If you had said Mac or just Linux, I could believe you. I am really interested, but I am afraid of this becoming vaporware.
Ignoring the usual "vim", "emacs" etc., do try Sublime Text 2, if all you're after is an editor. So far it's proved unfailingly excellent for me :).
FWIW Chris stated in a previous post that Lighttable would be built on embedding CodeMirror, which, being web-based, should make creating cross-platform builds much easier.
Chiming in that it works wonderfully on Windows, although I had some problems with font rendering being ugly. Maybe it's just that I don't use ClearType, but I had to change some of the font options to get a result I'm happy with.
"font_face": "droid sans mono",
"font_options":
[
"subpixel_antialias"
],
Ah, okay. I was about to say originally that it is entirely cross-platform, then I realized there was some qualitative language in the parent post and wondered if maybe the Windows flavor was just flawed somehow.
Agreed. One reason I use it is BECAUSE it runs the same across all platforms, and is the slickest editor on all of them. I do development in multiple OS/environments daily.