The French Ministry of Culture created an online exhibition on the reconstruction of Notre Dame after the fire of 15 April 2019, called “Notre-Dame de Paris, the construction site of the century”.
It is a way to thank foundations, companies, individual donors, communities and volunteers committed to the benefit of Notre-Dame de Paris.
You can find the exhibition here: https://notre-dame-de-paris.culture.gouv.fr/fr
Archives Portal Europe holds a lot of material on Notre-Dame de Paris, such as the plans and architecture designs: https://www.archivesportaleurope.net/ead-display/-/ead/pl/aicode/FR-FRAN/type/fa/id/FRAN_IR_050067/dbid/C348011412/search/0/_QUOTE_notre-dame+de+paris_QUOTE_
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