"FictFact is a tracking site focused on book series. Let us know what books/series you've read and we'll let you know what you need to read next and what's coming out soon. Registration is free, so let us know how you like it, and what series, books & authors we might be missing."
"What's Next" from the Kent District Library helps you "search adult fiction in series. A "series" is two or more books linked by character(s), settings, or other common traits."
