More like The Ringworld Engineers

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Starman JonesNovel
Robert A. Heinleinstandalone novel1953
About coming of age, set in spaceship.
“Starman Jones, a 1953 science fiction novel by Robert A. Heinlein, features a farm boy who wants to go to the stars.”
from the catalogue
HeecheeSeries
series19 books1972
completed
Science fiction and space opera, about aliens and space exploration, set in far future and other star systems.
“The Heechee are an advanced alien race that visited the Solar System hundreds of millennia ago and then mysteriously disappeared.”
from the catalogue
Start with Gateway →
Humanx CommonwealthUniverse
universe39 books1972
Science fiction, adventurous in tone, about aliens, set in far future and other star systems.
“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
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, War World, Laurie Jo Hansen
The Colors of SpaceNovel
Marion Zimmer Bradleystandalone novel1963
Mysterious in tone.
“The Lhari seem peaceful and friendly, but they go to some lengths to protect their monopoly on faster-than-light travel.”
from the catalogue
Mission to UniverseNovel
Gordon R. Dicksonstandalone novel1965
Adventure.
“Forever and a day - Brigadier General Benjamin Shore ignores a Presidential command and launches a revolutionary phase ship and its crew on an incredible journey deep into uncharted regions toward Galactic Centerpoint...”
from the catalogue