IrfanView - IrfanView ... one of the most popular viewers worldwide.
XnView MP - XnView is a free software that allows you to view, resize and edit your images. It supports more than 500 different formats!
Seer - A Windows Quick Look Tool in Qt.
Scheduler - Scheduler – Schedule Posts for Instagram, Facebook developed and published by Scheduler Inc.
Eye of Gnome (eog) - Simple image viewer for the GNOME desktop.
Facebook Pages Manager - Learn how to manage your Facebook Page and discover all the available tools that give you control over your business Pages.