More like Parallelogram

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KairosSeries
series11 books1962
completed
Science fiction.
Start with A Wrinkle in Time →
FoundationUniverse
universe123 books1940
About robots, set in far future.
“There is a science that reads the future of quadrillions the way an astronomer reads the orbits of stars.”
from the catalogue
Start with Foundation →
includes The Positronic Robot Stories, Foundation, Trantorian Empire, Second Foundation Trilogy, The Collected Fiction of Isaac Asimov, Foundation (Original Stories)
The Merchant PrincesSeries
series14 books2004
Science fantasy and alternate history, about political intrigue.
“In the series, there exist a number of parallel worlds, all of which are on the same geographical Earth but with different societies at different points of development.”
from the catalogue
Start with The Family Trade →
Firebird (Claudia Gray)Series
series4 books2014
About forbidden love.
“Marguerite's physicist parents' most astonishing invention, called the Firebird, allows users to jump into multiple universes.”
from the catalogue
Start with A Thousand Pieces of You →
WWW TrilogySeries
series3 books2009
About artificial intelligence, set in north america.
Start with Wake →
Dark MatterNovel
Blake Crouchstandalone novel2016
Thriller & suspense, set in north america.
“Jason Dessen, college physics professor, husband and father, is kidnapped and taken to a parallel universe where his counterpart had dedicated his life to inventing a method of traveling between an infinity of parallel universes.”
from the catalogue