More like New Rules for Battles

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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 Company Wars, Chanur, Mri Wars, Hanan Rebellion, Era of Rapprochement, Age of Exploration, The Hinder Stars, Unionside
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 Man-Kzin Wars, Fleet of Worlds, Ringworld
VattaUniverse
universe10 books2003
Space opera, set in other star systems.
“Get kicked out of the Academy and the family still hands you a ship.”
from the catalogue
Start with Trading in Danger →
includes Vatta's War, Vatta's Peace
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 First Formic War, Ender's Shadow, Ender Wiggin, Second Formic War, Fleet School
Berserker (Fred Saberhagen)Series
series59 books1963
Space opera, about robots and artificial intelligence, set in other star systems.
Start with Berserker →
Space BeagleSeries
series5 books1939
completed
Space opera, about aliens and space exploration, set in spaceship.
Start with Black Destroyer →