Calibre Web - Calibre Web is a web app providing a clean interface for browsing, reading and downloading eBooks...
calibre - Ebook manager, viewer & converter
COPS - Simple OPDS / HTML content server for small servers.
Komga - Media server for comics/mangas/BDs with API and OPDS support.
Ubooquity - Ubooquity is a free, lightweight and easy-to-use home server for your comics and ebooks.
Ruler for Windows - It's a screen ruler for Windows.