Flickr - image and video hosting website
Sketchucation - Sketchucation is a 3D SketchUp Community for students, professionals, designers, and hobbyists.
Imgur - Imgur is a free and simple image hosting service with image editing feature. Signup is optional.
3dxo.com - 3dxo.com is a great place for both professionals and hobbyists to find some really cool, free 3D models.
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.
TheSketchupEssentials - TheSketchupEssentials is a community to get SkethuUp tutorials and help from professionals.