CGTrader - CGTrader is an online marketplace at which artists can sell and buy Revit and 3D models.
Shape Divider - Create fully responsive shape dividers for your next project
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
Deck UI Kit by InVision - A cross-platform UI kit for building card-based layouts
TurboSquid - TurboSquid offers 3D models for professionals.
Now UI Kit - A beautiful Bootstrap 4 UI kit. Yours free.