New Google Photos - Shared suggestions, libraries and photo books
Adobe Photoshop - Adobe Photoshop is a webtop application for editing images and photos online.
Viso - Beautiful minimal image viewer for MacOS
GIMP - GIMP is a multiplatform photo manipulation tool.
Google Photos - All your photos are backed up safely, organized and labeled automatically, so you can find them fast, and share them how you like.
Affinity Photo - Affinity is the imaging and design suite for creative professionals exclusively for Mac.