It's worth experimenting with dates, languages and the "site map" function on Wayback Machine.
Rayman2DC.com (seems pretty broken to me)
Rayman2.ubi.com (warning, loud music)
Raymanzone Forum, 2005
Ubisoft.com, 1997! Rayman 1 is under "games"
Video Game Journalism
Behind Rayman 2, IGN
Frederic Houde (Ubisoft) – Interview, Arcade Attack
The Making of Rayman, Retrogamer
Ubisoft staff personal sites
This is their personal stuff and isn't officially released by Ubisoft. You should probably ask for permission before posting this content.
Eric Peletan. Instagram
Floraine Marchix. Blogspot
Jean-Brice Dugait. Artstation
Manuel Hauss. Pinterest
Michel Ancel. Instagram