Metager is a German metasearch that combines search results from other providers. It is a non-profit association, the source code is open, and the servers run on green electricity. Metager also advertises high privacy.
MetaGer is hosted on Hetzner.
metaGer powers its platform with 100% green energy, because they use Hetzner as a hosting provider.
Read more on the sustainability page of the service.