XnView MP - XnView is a free software that allows you to view, resize and edit your images. It supports more than 500 different formats!
Pho.to - Improve and play with your digital pictures at Pho.
JPEGView - JPEGView is a small and fast viewer/editor for JPEG, BMP, PNG, GIF and TIFF images.
Image Plus - Premium Multimedia Apps for macOS, iOS and Windows
IrfanView - IrfanView ... one of the most popular viewers worldwide.
Preseters - Preseters is an app by ArtHouse Design Studio that lets you access the complete list of available presets for Lightroom so you can download them to your mobile phone without much of a stretch.