If you're looking for native tmux tabs, Terminator unstable has initial support, for instance.
If you're looking for things like toolbelt, or built-in regexp highlighting, or other (arguably nice) bells and whistles, I suspect most of them would be provided by separate utilities. (Yes, it's a distant echo of the "Unix way".)
Bookmarks in scrollback are neat, though, and cannot be easily added by a third party. I don't remember an implementation, though.
If you're looking for things like toolbelt, or built-in regexp highlighting, or other (arguably nice) bells and whistles, I suspect most of them would be provided by separate utilities. (Yes, it's a distant echo of the "Unix way".)
Bookmarks in scrollback are neat, though, and cannot be easily added by a third party. I don't remember an implementation, though.