Stephen King's The Plant is, according to the author, now complete, in that a beginning middle and end has been published on the net. On his own official website www.stephenking.com he does appear to hint that more of The Plant will follow but that what has been published already is a complete entity in itself.
Visit The Free Library of Classics which provides free on-line books,
etexts; of over 200 of the world's most famous novels, plays, short
stories, poems and historical documents in their entirety for your
reading pleasure and edification.
http://www.information-resources.com/Library/library.html
The National Academy Press (the publishing arm for the National Academies in the U.S.) has more than 1800 books to read online, for free. All of their books are about science, but don't let that put you off. There's lots of interesting stuff if you look around. Some book titles for example: Marijuana as Medicine; Reefscape (about the Great Barrier Reef); and Empire of LIght (about science and art). Their web site is www.nap.edu