Flickr - image and video hosting website
Visily - The easiest and most powerful wireframe software for agile teams.
Imgur - Imgur is a free and simple image hosting service with image editing feature. Signup is optional.
PSD to Sketch Design Converter - Convert a Photoshop design to a layered Sketch file for free
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.
Learn SpriteKit by Design+Code - Make a platformer iPhone game from scratch in Swift 4.