Bibliovore is a good-looking eBook reader and manager app for Windows 8.1 and later.
The app imports individual ePub and PDF files, and can scan and open the contents of a folder tree.
Double-click anything in your collection and it opens, ready for reading. Initially you get a simple two-page view with Next/ Back buttons, but right-clicking displays single page option and a page slider, and gives quick access to the Table of Contents and any bookmarks you've made.
Simple library management tools allow you to edit metadata, search, view and organise your eBooks by authors, books, categories, series and more.
Bonus web features include the ability to keep your library on OneDrive, and browse/ download books from Project Gutenberg and Ebooks Gratuits.
Bibliovore looks good, but the interface isn't always intuitive (we occasionally got lost) and the online library search didn't work well for us.
Still, the program displayed all our test books without any problems, the OneDrive support is useful, and the 4-star rating suggests most users are happy.