From Arthur S. Banks, to quantify variables covered in Stateman's Yearbook. Over 200 indicators spanning 200 countries, some dating to 1815. Variables cover trade, conflict, infrastructure, expenditure, more.
Measures regime characteristics (democracy/autocracy) for all states over 500,000 from 1800 to 2018. Also find other data on conflict and peace at this link.
All countries, 1900-present, on various measures of democracy. Measures these democratic qualities: Electoral, Liberal, Participatory, Majoritarian, Consensual, Deliberative, and Egalitarian. Also provides subcomponent measures re. elections, judiciary, etc.