There is TECO for Linux, so I would suggest adding TECO to TIO. TECO was a well-known text editor and programming language. It has been made Turing-complete, so it should deserve being added to TIO.
I compiled TECO successfully, but trying to launch the teco executable complains about the lack of a pseudo-terminal, which is not available in the sandbox. I'm not sure if there's a way around this.
There is TECO for Linux, so I would suggest adding TECO to TIO. TECO was a well-known text editor and programming language. It has been made Turing-complete, so it should deserve being added to TIO.