CGTrader - CGTrader is an online marketplace at which artists can sell and buy Revit and 3D models.
Volumatik - Give volume to your ideas
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
Kimp - Kimp is an unlimited design company, specializing in graphic design (including print and digital designs, custom illustrations, landing page designs and email designs) and video design.
TurboSquid - TurboSquid offers 3D models for professionals.
MyMiniFactory - MyMiniFactory is the world’s leading curated platform for 3D printable objects.