The SILL About page translated explains the list :

https://code.gouv.fr/sill/readme

Why this catalog?

The socle interministériel de logiciels libres (SILL) is the reference catalog of open-source software recommended by the French government for use throughout the administration.

This catalog helps administrations find their way around the open-source software they are encouraged to use, in line with Article 16 of the French Law for a Digital Republic

Surprised to see docker there after the rugpull they did some time ago.

That's cool, I hope ONLYOFFICE gets some love one day too. I vastly prefer the GUI at least in the word processor. Also open source.

note I'm only using it for writing, can't speak to the rest of the suite