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
I’m curious how many european countries outside the Union will follow. Swiss cooperative Migros stopped labelling their food product, because it cost too much and was barely used.