Img.vision - Image hosting & video hosting for eCommerce sellers
CGTrader - CGTrader is an online marketplace at which artists can sell and buy Revit and 3D models.
UploadHouse - Thumbnail and resize your photos and images
3DExport - 3DExport is a 3D model marketplace where you can buy and sell 3D models, CG textures and digital objects for 3D printing with royalty free. Professional 3D models - 3DExport.com
ImageVenue - ImageVenue is a great online hosting service that allows uploading pictures for showing creative works with a simple-to-use technique.
TurboSquid - TurboSquid offers 3D models for professionals.