More like Purgatory's Key

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CoDominiumUniverse
universe98 books1971
Military science fiction.
“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
Known SpaceUniverse
universe142 books1964
Science fiction, about aliens, set in far future and space.
“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
Alliance-UnionUniverse
universe173 books1976
Science fiction, 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, Company Wars, Mri Wars, The Hinder Stars, Hanan Rebellion, Unionside, Era of Rapprochement, Age of Exploration
The AvatarNovel
Poul Andersonstandalone novel1978
Mysterious in tone.
“With the aid of the political opposition, they escape and journey through the portal in search of knowledge, and perhaps even to meet those who created the portal system.”
from the catalogue
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 →
Old Man's WarSeries
series16 books2005
Military science fiction, about war.
“Sign a document at 65, saying you intend to join up 10 years later.”
from the catalogue
Start with Old Man's War →