Interact is an Expect command which "gives control of the current process to the user, so that keystrokes are sent to the current process, and the stdout and stderr of the current process are returned." [L1 ]
Interact is quite amazing.
While there is Expect for languages other than Tcl, in the sense that a few other languages have extensions that (partially) manage ptys and demand-response dialogues, I know of no other that offers interact's functionality.