Flickr - image and video hosting website
F-Stop Media Gallery - Image and video organizer.
Imgur - Imgur is a free and simple image hosting service with image editing feature. Signup is optional.
A Photo Manager - Manage local photos on Android: gallery, geotag with photomap, tags, find, sort, view, copy...
PhotoPrism.app - PhotoPrism® is an AI-Powered Photos App for the Decentralized Web. It makes use of the latest technologies to tag and find pictures automatically without getting in your way. You can run it at home, on a private server, or in the cloud.
LeafPic - LeafPic is a fluid, material-designed alternative gallery.