Eggsactly Batman!
and A Canticle for Leibowitz
and Ring World
and Snow Crash
and The Moon is a Harsh Mistress
and A Stranger in a Strange Land
and Dayworld
and Island in the Sea of Time
and Dies the Fire
and Cryptonomicon
and Lucifer's Hammer
and Earth Abides
and Alas Babylon
and Foundation
and Fallen Angels (by Larry Niven, Jerry Pournelle, and Michael Flynn)
and Neuromancer
etc. etc. etc.
Canticle for Leibowitz is my favorite of all of them, but imho impossible to film.
Heck, it’s hard to explain it to anyone under 50.
I would NEVER trust Hollywood with stranger in a strange land. They would just turn it into a PC left wing fiasco.
Little Fuzzy
Any of A. Bertram Chandler’s John Grimes books (heck - make a mini-series out of them)
The Amber series
Pern