Cartogrammer extraordinaire Benjamin Hennig has produced cartograms of the 2017 German federal election results. A second set of cartograms looks at voter turnout and each party’s share of the vote. These cartograms distort for population to compensate for densely populated areas, so that the choropleth maps used for election results are proportionate.
The German data visualization studio webkid worked on a number of election maps; they have a roundup of election maps and infographics they worked on as well as from other media organizations.