ACDSee - ACDSee is an image viewer that uses very little system resources, and it has a small, sleek size that won't take up much space on your system.
Photoscape - high quality photo editing software, that enables you to fix and enhance photos.
digiKam - Professional Photo Management with the Power of Open Source
Polarr - MacOS, Windows, iOS, Android and online photo editing tools & free photo editors.
Flickr - image and video hosting website
Fotor - Fotor is an all in one visual platform. It includes photo editor, collage maker, and graphic designer. You are free to make a visual look more beautiful.