More like Devils' Due

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Forever WarSeries
series10 books1972
Set in space.
Start with Hero →
ArmorNovel
John Steakleystandalone novel1984
About madness.
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
Berserker (Fred Saberhagen)Series
series59 books1963
Space opera, about robots and artificial intelligence, set in space.
Start with Berserker →
CoDominiumUniverse
universe98 books1971
Science fiction and military science fiction, set in other star systems and 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, War World, Falkenberg's Legion, Laurie Jo Hansen
Known SpaceUniverse
universe142 books1964
Set in 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 Man-Kzin Wars, Ringworld, Fleet of Worlds