Diuturnity's Dawn: Book Three of the Founding of the Commonwealth
Alan Dean Foster
The Number of the Beast: A Parallel Novel About Parallel Universes
Robert A. Heinlein
The World As Myth (2)
Timelike infinity
Stephen Baxter
Xeelee Sequence (2)
Tales from the Perilous Realm
J.R.R. Tolkien
Middle-earth Universe (1)
The Infinite Moment of Us
Lauren Myracle