Les Académiques
Connected Papers
Google Scholar
Isidore
Scinapse
Semantic Scholar

Les Généralistes
A
AOL Search – Ask
B
Bing – Brave
D
Dogpile
Duck Duck GO
E
Ecosia
F
Fireball
G
Google – Google Books
I
Internet Archive
L
Looksmart
Lycos
N
Neeva
Q
Qwant
W
Wayback Machine – WebCrawler – Wikipedia – Wolfram Alpha
Y
Yahoo