| # | Name | Parties | Matches |
|---|---|---|---|
| Manifesto Project | 11 | 11 | |
| ParlGov | 22 | 22 | |
| Wikipedia | 20 | 20 | |
| CHES | 9 | 9 | |
| CLEA | 12 | 12 | |
| EJPR PDY | 11 | 11 | |
| CHISOLS | 5 | 5 | |
| DPI | 16 | 16 | |
| ESS prtc* | 10 | 10 | |
| ESS prtv* | 11 | 11 | |
| PolCon | 8 | 8 | |
| PPMD (2006) | 8 | 8 | |
| World Values Survey | 7 | 7 | |
| ERDDA (2013) | 10 | 10 | |
| euandi (GPS) | 8 | 8 | |
| Global Elections DB | 5 | 5 | |
| MAPP | 5 | 5 | |
| Mudde (2007) | 1 | 1 | |
| PIP | 7 | 7 | |
| POPPA | 8 | 8 | |
| TAP | 6 | 6 | |
| The PopuList | 3 | 3 | |
| EES 2014 | 6 | 6 |