MuPDF

MuPDF is a lightweight and open-source software toolkit designed for viewing, editing, and manipulating PDF files and other document formats like XPS and EPUB. It's known for its speed and efficiency, making it ideal for applications where performance is important. Developers can use MuPDF to integrate document rendering into their own applications or websites. It provides features like text extraction, annotations, and more, while maintaining a small footprint, which means it doesn’t require extensive resources, making it suitable for mobile and embedded devices.