SumatraPDF is an open source reader app that allows you to open and read PDF, EPUB, MOBI, CBZ, CBR, FB2, CHM, XPS, DjVu, and images for free.

And you can share the software without repercussions. Similar to Adobe Acrobat, open-source PDF editors come with different tools for altering PDF files, from adding text to merging pages.

Android users can currently open PDFs on Google Chrome for desktop using the Chrome PDF Viewer plug-in, while the mobile version redirects to the Google Drive PDF viewer or requires the Google PDF ...