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!
InstaBeauty – Makeup Camera! - InstaBeauty – Makeup Camera app comes up with features to help you in accessing an extensive collection of makeup styles and filters to edit your selfies.
IrfanView - IrfanView ... one of the most popular viewers worldwide.
Facetune - Facetune is a fun and powerful portrait & selfie photo editor!
FastStone Image Viewer - FastStone Image Viewer is a fast, stable, user-friendly image browser, converter and editor.
CreamCam - CreamCam called itself a selfie filtering application but offers a portrait enhancement features and tools to its users.
JPEGView - JPEGView is a small and fast viewer/editor for JPEG, BMP, PNG, GIF and TIFF images.