Tmux is fairly new, BSD-licensed, and has a much smaller/cleaner codebase than screen. It's quickly gotten features that people have been struggling to add to s

Tmux is fairly new, BSD-licensed, and has a much smaller/cleaner codebase than screen. It's quickly gotten features that people have been struggling to add to screen for years. (It comes with dwm/xmonad-style layouts out of the box, for one.) If you already use screen and are happy with it, it's probably not worth switching, but if you're starting new, I'd suggest learning tmux first. You might want to get a fairly recent version of the source, though - it's in the main OpenBSD tree now, and it has been improving pretty quickly. If you use Unix & ssh at all, definitely learn one of them. Yesterday, if possible. One of these days I really need to write about getting started with tmux...