De Gruyter yayınevi, edergilerini ve aşağıda bulunan iki veritabanını 30 Haziran 2020 tarihine kadar ücretsiz erişime açmıştır. 
Linkteki: https://www.elsevier.com/solutions/sciencedirect/content/book-title-lists?sf231962702=1 
Nietzsche Online 

https://www.degruyter.com/view/db/nietzsche

https://db.degruyter.com/db/nietzsche

Energy Online

https://www.degruyter.com/view/db/energyo

https://db.degruyter.com/db/energyo Enhanced Electronic Grammars
https://www.degruyter.com/view/db/eeg
https://db.degruyter.com/db/eeg