Books in Series - Nebraska Library Commission database, as well as links to other series websites.

Locus Index to SciFi - From Locus Magazine.

Series Character List - From the site "Stop, You're Killing Me"

What's Next - Kent District Library's site for looking up books by author, title or series to see the entire series list.

Books in a Series - From Monroe County Public Library.

Juvenile Series & Sequels - Mid-Continent Public Library has series for both Teens and Children.