| Survey Networks |
| Survey4Profit |
| MemoLink |
| PermissionResearch |
| ECN Research |
| LightSpeed |
| The Net Panel |
| Greenfield Online |
| Opinion Square |
| Nielsen Net Ratings |
| Surveys |
| WinningSurveys.com |
| Survey Adventure |
| Panda Research |
| Survey Princess |
| Ipsos Survey |
