| # | Name | Parties | Matches |
|---|---|---|---|
| ParlGov | 30 | 30 | |
| Manifesto Project | 15 | 15 | |
| ERDDA (2013) | 14 | 14 | |
| Morgan (1976) | 13 | 13 | |
| Mackie / Rose (1991) | 22 | 22 | |
| CHES | 11 | 11 | |
| EJPR PDY | 12 | 12 | |
| Kitschelt (2013) | 8 | 8 | |
| KUREP (2012) | 8 | 8 | |
| Huber / Inglehart (1995) | 9 | 9 | |
| EPAC (2018) | 9 | 9 | |
| Ray (1999) | 13 | 13 | |
| PPMD (2006) | 8 | 8 | |
| CLEA | 27 | 27 | |
| World Values Survey | 11 | 11 | |
| EES 2014 | 8 | 8 | |
| PolCon | 15 | 15 | |
| CHISOLS | 5 | 5 | |
| DPI | 9 | 9 | |
| Jennings / Wlezien | 6 | 6 | |
| Wikipedia | 30 | 30 | |
| Global Elections DB | 10 | 10 | |
| Laver / Hunt | 11 | 11 | |
| euandi (GPS) | 10 | 10 | |
| Elections Global | 15 | 15 | |
| EP roll call votes | 7 | 7 | |
| IPOD | 12 | 12 | |
| MAPP | 10 | 10 | |
| CSES-IMD | 9 | 9 | |
| CCS | 10 | 10 | |
| PIP | 13 | 13 | |
| Mudde (2007) | 1 | 1 | |
| The PopuList | 3 | 3 | |
| V-Party | 17 | 17 | |
| POPPA | 9 | 9 | |
| TAP | 4 | 4 | |
| GPD | 1 | 1 | |
| PPMD (all) | 14 | 14 | |
| ESS prtc* | 24 | 24 | |
| ESS prtv* | 24 | 24 | |
| GPS 2019 | 9 | 9 | |
| NPED | 10 | 10 | |
| WhoGov | 14 | 14 | |
| Leaders Global | 8 | 8 | |
| PPEPE (2021) | 1 | 1 | |
| PAGED | 14 | 14 | |
| EU-NED | 14 | 14 | |
| Wikipedia tags | 17 | 17 | |
| Poll of Polls | 10 | 10 |