More like Between the Galaxies

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CoDominiumUniverse
universe98 books1971
Military science fiction, set in other star systems.
“The body of work runs along a few hard threads rather than one line.”
from the catalogue
Start with The Mote in God's Eye →
includes Moties, Laurie Jo Hansen, Falkenberg's Legion, War World
Space BeagleSeries
series5 books1939
completed
About aliens, set in spaceship.
Start with Black Destroyer →
ThistledownSeries
series5 books1978
completed
Hard science fiction.
Start with The Wind from a Burning Woman →
Known SpaceUniverse
universe142 books1964
About aliens, set in other star systems.
“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, Fleet of Worlds, Man-Kzin Wars
UpliftUniverse
universe13 books1980
About uplift and aliens, set in other star systems.
“No species, the Galactics insist, ever climbs to sapience alone.”
from the catalogue
Start with Sundiver →
includes Uplift, Uplift Storm
CommonwealthUniverse
universe12 books2002
Science fiction and space opera, set in far future.
“Step aboard the train at the Second Chance terminal and ride the wormhole to another star.”
from the catalogue
Start with The Dreaming Void →
includes Commonwealth Saga, Void Trilogy, Chronicle of the Fallers