MuPDF is a free and open-source software framework written in C that implements a PDF, XPS, and EPUB parsing and rendering engine. It is used primarily to render pages into bitmaps, but also provides support for other operations such as searching and listing the table of contents and hyperlinks. Developed by Artifex Software, Inc.
License: Open Source
ePDFView is a user-friendly PDF viewer that caters more to casual users with basic features, while MuPDF is a robust, open-source solution designed for those needing advanced functionality and customization options. The choice between the two largely depends on the user's technical expertise and specific PDF management needs.