Developers

Aurelien Topia | Lead Gameplay Programmer (Twitter)
Jordan Layani | Design Director (Twitter)
Olivier Gaertner | Lead Engineer
Pierre Tarno | Creative Director (Reddit) (Nickname nobugz DisID#3722)
Jessica Bruno | Associate Producer
Michel Donzé | Art Director (Artstation) (Sketchfab) (Twitter)
Victorien Berry | Character Artist (Artstation)
Paul-Emile Boucher | Environemnt & FX Lead Artist (Official site) (Artstation)
Adrien Cachinho | Environment Artist
Marwan Ghandri | Environment Artist (Artstation)
Roxane Hinh | Environment Artist (Artstation)
Clément Masset | Environment Artist (Artstation)
Marjolaine Paz | UI Artist (Official site) (GitHub)
Andriana Portailler | FX Artist
Joao Pereira | Technical Artist
Mickael Floury | Technical Artist (Artstation)
Marianne Drahonnet | Character Artist (Artstation)
Servane Altermatt | Concept Artist (Artstation)
Vijay Krish | Concept Artist (Artstation) (Tumblr)
Rémi Moreaux | UI Artist (Official site)
Tim Guthmann | Technical Artist
Thibault Cabanas | Senior UI Artist (Twitter) (Steam) (Tumblr) (flickr) (Nickname Naotib DisID#3224)
Côme ROY - Concept Artist (not listed as a team member) (Artstation)
Youri Portailler | Gameplay Programmer
Marc Descourtis | Senior Online Engineer
Moussa Thiobane | Online Engineer
Thomas Riboud | Senior Gameplay Programmer
Augustin Gardette | Gameplay Programmer
Sylvain Miguelez | Junior Gameplay Programmer
Nicolas Leroy | Gameplay Programmer
Amine Tahri | Senior Gameplay Programmer
Florian Droit | Gameplay Programmer
Ludovic Aubertin | Junior Gameplay Programmer
Jean-Michel Barbecue | Seamless Programmer
Jules Ducasse | Game/Level Designer
Clément Plantier | Game Designer (Twitter)
Mathieu Leclercq | Game/Level Designer (Official site) (Twitter) (mastodon) (Nickname Gama)
Hary Ramaroson | Animation Art Director (Artstation)
Kevin Roger | Gameplay Animator (Artstation) (Twitter)
Marc Pinta | Cinematics Animator
William Magnin-Lambert | Junior Animator (Official site)
Romain Ferrand | Junior Animator
Amandine Giro | Junior Animator
Arnaud Noble | Sound Designer
Aymeric Schwartz | Sound Designer
Lucas Rousselot | Sound Designer
Music by Austin Wintory (Official site) (Twitter)
Risryn Boss Fight music by RZA and Austin Wintory
-- --
Tom Strahle | Guitars
Kristin Naigus | Woodwinds
-- --
Producer and mixer Austin Wintory
Dan Griliopoulos | Narrative Consultant (Blog) (Twitter)
Alec Meer | Narrative Consultant
Kezia Burrows | Voice Actor (Risryn)
Nina Yndis | Voice Actor (Kilnor)
Stephane Cornicard | Voice Actor
Mark Healy | Voice Actor
All voice recordings made by SIDE UK

Also, some meet on the forum (it is not known who is who, because on the forum they only have nicknames)
SLCP_ULTRABLUE
SLCP_VANGUARD
SLCP_KAOLIN
SLCP_WATERFALLX
SLCP_CLEM
SLCP_FUROLLES
SLCP_VALKYRIE
SLCP_ROCKWILLOW
SLCP_STROCHNIS
SLCP_RUSSIANWOLF