| Site | Model Types | Free or Paid? |
|---|---|---|
| Thingiverse | 3D Printing | Free |
| NASA 3D Resources | 3D Printing, Archive/Documentation | Free |
| Instructables | 3D Printing | Free |
| Sketchfab | 3D Printing, Animation, Gaming | Paid |
| CGTrader | 3D Printing, Architecture/Visualization, Animation, Gaming, Graphic Design | Paid |
| TurboSquid | 3D Printing, Architecture/Visualization, Gaming, Graphic Design | Paid |
| GrabCAD | 3D Printing, Engineering | Paid |
| Free3D | Architecture/Visualization, Animation, Gaming, Graphic Design | Paid |
| Smithsonian X3D | 3D Printing, Animation, Graphic Design | Free |
| Cults | 3D Printing | Paid |
| PARTcloud | 3D Printing, Animation, Gaming, Graphic Design | Paid |
| BiblioCAD | Architecture/Visualization, Engineering, Graphic Design | Paid |
| Pinshape | 3D Printing | Paid |
| STLFinder | 3D Printing, Animation, Gaming, Graphic Design | Paid |
| 3dMdb | 3D Printing, Architecture/Visualization, Animation, Gaming, Graphic Design | Paid |
| 3DExport | 3D Printing, Animation, Gaming, Graphic Design | Paid |
| CADNav | Architecture/Visualization, Animation, Gaming, Graphic Design | Free |
| Archive 3D | Architecture/Visualization, Animation, Graphic Design | Free |
| Trace Parts | 3D Printing, Engineering, Architecture/Visualization | Free |
| YouMagine | 3D Printing | Free |
| Clara.io | 3D Printing, Animation, Graphic Design | Paid |
| 3DContentCentral | Engineering | Free |
| 3D CAD Browser | 3D Printing, Animation | Free |
| 3DModelFree | Architecture/Visualization, Animation, Graphic Design | Paid |
| Renderpeople | Architecture/Visualization, Graphic Design | Paid |
| 3D Scanstore | Animation, Gaming | Paid |
| MorphoSource | 3D Printing, Archive/Documentation | Free |
| National Insitute of Health 3D | 3D Printing, Visualization, Archive/Documentation | Free |
| 3D Printing | Paid |
(Note: sites listed as Paid may home some free content, but if you're looking there expect to pay money for any professional quality STLs/renders you may find.)