More like The Second UNIT Collection

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Known SpaceUniverse
universe142 books1964
Set in far future.
“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
CoDominiumUniverse
universe98 books1971
Military science fiction, set in far future.
“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, Falkenberg's Legion, Laurie Jo Hansen, War World
UpliftUniverse
universe13 books1980
Space opera, about uplift, set in far future.
“No species, the Galactics insist, ever climbs to sapience alone.”
from the catalogue
Start with Sundiver →
includes Uplift Storm, Uplift
Alliance-UnionUniverse
universe173 books1976
Set in far future.
“Around that spine cluster the merchanter novels of trader Families, the Faded Sun trilogy of human envoys among the martial alien Mri, and the Chanur books, narrated from the hierarchical, whiskered viewpoint of the hani.”
from the catalogue
Start with Heavy Time →
includes Chanur, Mri Wars, Hanan Rebellion, Era of Rapprochement, Age of Exploration, The Hinder Stars, Company Wars, Unionside
Have Space Suit - Will TravelNovel
Robert A. Heinleinstandalone novel1958
Space opera, about space exploration, set in near future.
“One minute Kip Russell was walking about in his own backyard, testing out an old space suit and dreaming about going to the moon - and the next he was out cold and the captive of an insidious space pirate.”
from the catalogue
Humanx CommonwealthUniverse
universe39 books1972
Set in far future.
“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