Here are the top 2 most popular chapter wordpress plugins as derived from our WordPress Plugin Popular Score which is a continually popular score, it denotes an estimated popularity of a wordpress plugin.
1. Chapters
Easy-to-use, ajax-powered plugin to edit summaries/lists of a group of posts and/or pages that you collect together in a 'book'....Popular Score : 11,900,000
2. Kommiku
Kommiku is a Online Media Viewer....Popular Score : 13,600