WinDjView - WinDjView is a fast, compact and powerful DjVu viewer for Windows with tabbed interface, continuous...
Foxit Reader - Foxit Reader is a free and light-weight multi-platform PDF document viewer.
DjVuLibre - DjVuLibre: Open Source DjVu library and viewer
Sumatra PDF - Sumatra PDF is a slim PDF/DjVu/EPUB/XPS/CHM/CBR/CBZ/MOBI viewer for Windows.
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!
DjVu Browser Plug-in - DjVu viewer for Firefox and Safari browsers