CGTrader is described as 'online marketplace at which artists can sell and buy Revit and 3D models' and is an app in the Photos & Graphics category. There are four alternatives to CGTrader for Online / Web-based, PHP, iPhone and MySQL Community Edition. The best alternative is Blomming, which is free. Other great apps like CGTrader are BriskSale.com (Free), 3DOcean (Paid) and 3DExport (Free).
3DOcean is part of Envato Market. At 3DOcean you can buy and sell royalty-free 3D models, textures, concepts, and materials and shaders. Items are priced on the complexity, quality and use of the file; the total price also includes a Buyer Fee.
3DExport is a store where you can buy and sell 3D models, textures, plugins, and 3d printable models for using in CG projects. Our 3D Models Marketplace was launched in February 2004, and now we are one of the world's largest providers of 3D content.