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
Zathura is a highly customizable and keyboard-driven PDF viewer that supports multiple formats, making it ideal for users who prefer efficient navigation and lightweight applications. In contrast, MuPDF offers high-quality rendering and supports various document formats but is more limited in editing features and may require a command line interface, which could be less user-friendly.