[link|http://silk.apana.org.au/fc.html|It]'s 32-bit, very functional, very stable, and being text mode - quick. It started out on OS/2. I've been using it since v0.09 or something like that.
[link|http://silk.apana.org.au/pub/fcw/fcw230-dev.zip|Here] is the latest beta version. You'll need the release version 2.20 to get the help file, etc., to know the function of the key combinations (beyond the NC keys, that is).
It's shareware, but I think it competes very well with a lot of the freeware file managers/editors/etc. out there.
There's occasional talk on the mailing list about a Linux version, but I don't think Brian has committed to that.