KissPDF

KissPDF is a free and open-source PDF viewer and editor for Windows, Linux, and macOS. It is designed to be lightweight and easy to use, with a simple and intuitive interface. The software supports a wide range of PDF features, including viewing, printing, annotating, and editing PDF documents. KissPDF also includes a built-in PDF converter that allows users to convert other file formats to PDF, such as images, text files, and Microsoft Office documents. The software is available in multiple languages and is regularly updated to ensure compatibility with the latest PDF standards. KissPDF is distributed under the GNU General Public License, making it a popular choice for users who prefer open-source software.