Here's a little list:
Ray Bradbury, Farenheit 451
Margaret Atwood, The Handmaid's Tale and Oryx and Crake
Kasuo Ishiguro, Never Let Me Go
Cormac McCarthy, The Road
If you want the grand-daddy of dystopian future books, you might consider We by Yevgeny Zamyatin. It was written in 1921, though it saw publication in English and French long before it was published in Zamyantin's native Russia. There are some sci-fi themes but not too much (apparently they eat a petroleum-based diet that killed off the majority of the population when it was introduced!). Anyway, Orwell said it was definitely an influence on 1984, and he thought but couldn't confirm that Huxley was aware of it as well.
Yes, I've read We. Bit fragmentary, but fascinating as a source for Orwell and possibly Huxley, as you say.