More like Backworlds

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UpliftUniverse
universe13 books1980
About uplift and aliens.
“No species, the Galactics insist, ever climbs to sapience alone.”
from the catalogue
Start with Sundiver →
includes Uplift, Uplift Storm
Cities in FlightSeries
series10 books1950
completed
Science fiction and space opera, about space colonization, set in far future and space.
“The stories cover roughly two thousand years, from the very near future to the end of the universe.”
from the catalogue
Start with They Shall Have Stars →
Known SpaceUniverse
universe142 books1964
About aliens.
“Give a clever species a few centuries and a working fusion drive, and it will fill the sky with problems.”
from the catalogue
Start with Ringworld →
includes Ringworld, Man-Kzin Wars, Fleet of Worlds
Heaven Chronicles / Zones of ThoughtSeries
series8 books1976
Science fiction and space opera, set in far future and space.
Start with The Outcasts of Heaven Belt →
Humanx CommonwealthUniverse
universe39 books1972
About aliens.
“Two species that ought, by every buried instinct, to recoil from one another instead clasp hand to truhand and build a galaxy together.”
from the catalogue
Start with For Love of Mother-Not →
includes Pip & Flinx, Icerigger Trilogy, The Founding of the Commonwealth
Ender's GameUniverse
universe39 books1977
Science fiction, set in far future.
“To beat your enemy you must first understand him so completely that you love him — and in the instant you love him, you destroy him.”
from the catalogue
Start with Ender's Game →
includes Ender Wiggin, Ender's Shadow, First Formic War, Second Formic War, Fleet School