A freely downloadable novel by one of the best science fiction writers today.
The Metamorphosis of Prime Intellect
A very intense online novel about a post-singularity future. Warning: Contains strong language and extreme depictions of acts of sex and violence. Readers who are sensitive to such things should exercise discretion.
The author has also written an excellent series of short stories, which are less extreme, but no less fascinating.
The Fourth R
A child genius is created using a learning machine. But then James' parents are murdered for the machine, and his own life is in danger! The copyright has expired, so it may be downloaded from Project Gutenberg.