More like Unpublished Scenes and Chapters

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DuneUniverse
universe78 books1963
Space opera, about political intrigue.
“The desert planet, where empire runs on a single substance: the spice melange, which folds space, prolongs life, and unlocks prescience, and which exists nowhere else in the known universe.”
from the catalogue
Start with Dune →
includes Dune, Heroes of Dune, Dune Prequels, Background of the Dune Universe, Dune Sequels
The Fountains of ParadiseNovel
Arthur C. Clarkestandalone novel1979
Hard science fiction, about space exploration, set in space and space station.
“Set in the 22nd century, it describes the construction of a space elevator.”
from the catalogue
MesklinSeries
series6 books1954
completed
Hard science fiction, adventurous in tone, about aliens and space exploration.
“The idea came from an object that was at the time believed to exist in the 61 Cygni system, and which might represent an extrasolar planet.”
from the catalogue
Start with Mission of Gravity →
Star ColonyNovel
Keith Laumerstandalone novel1981
Space opera, about space colonization and political intrigue.
“For the first time, the authentic course of events has been extracted and separated from its overlay of myth and folklore.”
from the catalogue
Dragon's EggSeries
series3 books1980
completed
Hard science fiction and first contact, about aliens and space exploration.
Start with Dragon's Egg →
WheelersNovel
Ian Stewart & Jack Cohenstandalone novel2000
Hard science fiction and first contact, about aliens and space exploration.