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I just finished reading Cryptonomicon and Anathem, both by Neal Stephenson. If you're into extensively-researched thrillers, I'd give them a try. Both are over 1000 pages long. You can try out Blindsight by Peter Watts from here, and if you really like it (like I did) you can go buy Echopraxia. The rifters books, in comparison, are kind of shallow. Besides that, I don't have any outstanding recommendations in recent memory.
Thumbs up for Cryptonomicon and Anathem. Another sf recommendation: Wool by Hugh Howey. Not quite free, but well worth it.