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DjVuLibre - DjVuLibre: Open Source DjVu library and viewer
Foxit Reader - Foxit Reader is a free and light-weight multi-platform PDF document viewer.
Sumatra PDF - Sumatra PDF is a slim PDF/DjVu/EPUB/XPS/CHM/CBR/CBZ/MOBI viewer for Windows.
LibreOffice Viewer - The Document Foundation provides a LibreOffice Viewer for Android.
Xodo - Try easy-to-use PDF tools that keep your documents safe. Work with your important files across all platforms and devices with the ultimate all-in-one document solution. Your productivity lives at Xodo!