Democracy and elections worldwide (International IDEA)
International IDEA aims to advance democracy worldwide. Its mission is carried out by developing comparative knowledge and assisting democratic reforms, mainly in the areas of electoral processes, constitution building, political participation and representation.
In their website is possible to find data on voter turnouts for every world country and election, as well as on gender quotas in parliaments, and many other datasets concerning democracy and elections. All the data is in English, and immediately downloadable in tailored spreadsheets.
Besides the datasets, International IDEA offers many tools with which is possible, for instance, to do simulations on electoral systems or to compare various countries’ democratic indexes and see their evolution over time.