Angel novels have been published since 2000 by Pocket Books.
Authors who have written Angel novels: The books featured in this list are not part of Buffyverse canon.
They are not considered as official Buffyverse reality, but are novels from the authors' imaginations.
Unlike internet fan fiction however, all of these stories have been licensed as official Angel merchandise.
Furthermore, the overall concept for each Buffyverse story had to be accepted by Joss Whedon (or his office), who did not want these stories to venture too far from his original intentions.