More like Ringworld

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HeecheeSeries
series19 books1972
completed
Science fiction and space opera, about space exploration and aliens, set in far future and space.
“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 →
The Colors of SpaceNovel
Marion Zimmer Bradleystandalone novel1963
Science fiction and space opera, adventurous and mysterious in tone, about space exploration and aliens, set in far future and other star systems.
“The Lhari seem peaceful and friendly, but they go to some lengths to protect their monopoly on faster-than-light travel.”
from the catalogue
The AvatarNovel
Poul Andersonstandalone novel1978
Science fiction and space opera, adventurous and mysterious in tone, about space exploration and aliens, set in far future and space.
“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
Academy / Priscilla (Hutch) HutchinsSeries
series16 books1983
Science fiction, about space exploration and aliens, set in far future and space.
“Beginning with The Engines of God, the series treats deep time and the near-total absence of intelligent alien life as its central mystery, favoring slow-burn discovery over action.”
from the catalogue
Start with The Engines of God →
UpliftUniverse
universe13 books1980
About uplift.
“No species, the Galactics insist, ever climbs to sapience alone.”
from the catalogue
Start with Sundiver →
includes Uplift Storm, Uplift
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