Huge collection of desperate stuff, including science fiction, at Internet Archives' Audios, Movies, & Books collections. But even browsing to figure out interesting will be substantial effort - its very big.
Blue Tyson seems to have browsed at least part of the audio collection & has identified some things worth looking up:
- Robert Heinlein's "Methuselah's Children"; download audio: Not read.
- Arthur Clarke's "Childhood's End"; download audio: One of the most famous novels of Clarke, though I found it among his worst (its original short story version with James Blish, "Guardian Angel", is a far better read that cuts out the crap). Later parts are essentially a religious story - a retelling of one of the Hindu beliefs.