XnView MP stands for Multi Platform = it is available for Windows, Linux and MacOS. It is a continuation of the older XnView Classic. In my opinion it is a great alternative to Windows photos app or any Linux image viewer that comes preinstalled. I even think it is an alternative to IrfanView. It is really fast and simple to use, supports more than 500 image formats, has built in folder browser, image converter, editor... AND MORE!
IrfanView - IrfanView ... one of the most popular viewers worldwide.
REPOST IT! FOR INSTAGRAM - REPOST IT! FOR INSTAGRAM is an easy-to-use app by Digi set though which you can schedule desired posts to upload them on Instagram automatically.
FastStone Image Viewer - FastStone Image Viewer is a fast, stable, user-friendly image browser, converter and editor.
Apphi - Apphi – Schedule Posts for Instagram is a Free to Use Mobile Application that automatically posts your scheduled Instagram photos and videos.
JPEGView - JPEGView is a small and fast viewer/editor for JPEG, BMP, PNG, GIF and TIFF images.
Repost FOR Instagram - Repost FOR Instagram is a social app that enables you to quickly post all saved photos and videos from your phone to Instagram.