All three have sequels, but none of the three require reading of the sequels since they're properly standalone novels. (And in the case of Dune, some readers feel the sequels are weak enough that they should be ignored. I don't agree, but I can see their point.)
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* Dune - Frank Herbert
* The Curse of Chalion - Luis McMaster Bujold
* Neuromancer - William Gibson
All three have sequels, but none of the three require reading of the sequels since they're properly standalone novels. (And in the case of Dune, some readers feel the sequels are weak enough that they should be ignored. I don't agree, but I can see their point.)