| # | Name | Parties | Matches |
|---|---|---|---|
| Manifesto Project | 11 | 11 | |
| ParlGov | 37 | 37 | |
| Wikipedia | 31 | 31 | |
| CHES | 9 | 9 | |
| CLEA | 22 | 22 | |
| EJPR PDY | 13 | 13 | |
| CHISOLS | 10 | 10 | |
| DPI | 9 | 9 | |
| ESS | 10 | 10 | |
| ESS prtc* | 12 | 12 | |
| ESS prtv* | 13 | 13 | |
| Huber / Inglehart (1995) | 5 | 5 | |
| Kitschelt (2013) | 5 | 5 | |
| PolCon | 21 | 8 | |
| PPMD (2006) | 4 | 4 | |
| CCS | 8 | 8 | |
| CSES | 9 | 9 | |
| EP roll call votes | 5 | 5 | |
| ERDDA (2013) | 9 | 9 | |
| euandi (GPS) | 6 | 6 | |
| Global Elections DB | 10 | 10 | |
| IPOD | 8 | 8 | |
| Janda (1980) | 3 | 3 | |
| Jennings / Wlezien | 6 | 6 | |
| KUREP (2012) | 5 | 5 | |
| Laver / Hunt | 5 | 5 | |
| Mackie / Rose (1991) | 16 | 16 | |
| MAPP | 9 | 9 | |
| Mudde (2007) | 2 | 2 | |
| ParlSpeech | 12 | 12 | |
| PIP | 9 | 9 | |
| POPPA | 6 | 6 | |
| PPDB (2017) | 5 | 5 | |
| Ray (1999) | 6 | 6 | |
| TAP | 3 | 3 | |
| The PopuList | 4 | 4 | |
| EES 2014 | 6 | 6 | |
| Thomas (1975) | 4 | 4 |