qBary
LiveHow it ends, and what happened so far: verified book endings and spoiler-safe series refreshers.
About
Every book on qBary has a verified answer to "how does it end?", and every series has spoiler-safe refreshers that catch you up before the next book.
A personal tracker ties it together: queue the books you want to read and keep a library of the ones you've finished. qBary also compares books with their screen adaptations, so you can see what changed.