Wiktionary contributors (de.wiktionary.org), extracted with Wiktextract (kaikki.org, Tatu Ylonen) and DBnary (kaiko.getalp.org, Gilles Sérasset, CC BY-SA 3.0)
wordfreq, CC-BY-SA-4.0
wordfreq 3.2 by Robyn Speer, data under CC BY-SA 4.0. Includes data from Wikipedia, OPUS OpenSubtitles 2018 (opensubtitles.org), the SUBTLEX word lists by Marc Brysbaert et al., Google Books Ngrams (books.google.com/ngrams), ParaCrawl and the Leeds Internet Corpus.