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IrfanView - IrfanView ... one of the most popular viewers worldwide.
Sumatra PDF - Sumatra PDF is a slim PDF/DjVu/EPUB/XPS/CHM/CBR/CBZ/MOBI viewer for Windows.
XnView MP - XnView is a free software that allows you to view, resize and edit your images. It supports more than 500 different formats!
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Facebook Pages Manager - Learn how to manage your Facebook Page and discover all the available tools that give you control over your business Pages.