More like The Third Monsters Collection

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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
Space BeagleSeries
series5 books1939
completed
Space opera, about space exploration, set in far future and spaceship.
Start with Black Destroyer →
Known SpaceUniverse
universe142 books1964
Set in far future and 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, Man-Kzin Wars, Fleet of Worlds
The Final ArchitectureSeries
series6 books2021
Space opera, about war, set in far future and other star systems.
“Eighty years ago, Earth was destroyed by an alien 'Architect'.”
from the catalogue
Start with Shards of Earth →
WolflingNovel
Gordon R. Dicksonstandalone novel1969
Space opera, about political intrigue, set in other star systems and far future.
“Jim was just another wolfling to Afuan - a lesser being from a backward colony world.”
from the catalogue
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, Company Wars, Age of Exploration, Era of Rapprochement, The Hinder Stars, Unionside