An interesting historical connection... A particular implementation of SLIP[1] (MAD-SLIP) is the language that ELIZA[2] was originally written in. Who knew that the GNU folks had developed a (somewhat) modern SLIP implementation in C++? Pretty rad, IMO.

[1]: https://en.wikipedia.org/wiki/SLIP_(programming_language)

[2]: https://en.wikipedia.org/wiki/ELIZA