[mgubi]

I would really like to have names of packages you use regularly and you think you will miss in any other system. I can think only of TikZ, and again, for targeted purposes like DSL you can always ask TeXmacs to run LaTeX and get the output. See e.g. https://twitter.com/gnu_texmacs/status/1605167149173153793

[GiovanniP]

Packages for chemistry are useful, even if I don't use them myself. Also siunitx needs yet a TeXmacs equivalent (I think https://github.com/pireddag/SIunits/tree/simple is not yet good enough)