Flickr - image and video hosting website
Pushover - Real-time notifications on your Android, iPhone, iPad, and Desktop
Imgur - Imgur is a free and simple image hosting service with image editing feature. Signup is optional.
Pushbullet - Pushbullet - Your devices working better together
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.
Gotify - a simple self-hosted server for sending and receiving messages