SICP in GNU TeXmacs
github.com
github.com
So that it could be used by students on modest computers that couldn't manage a Web browser and running Scheme at the same time:
https://www.neilvandyke.org/sicp-texi/
As part of this, they redrew the figures in SICP as ASCII art (not as something like TeX figures), which I guess made sense for those requirements. Though today I like the idea of using proper markup for figures.