Searx aggregates different search engines. YaCy is peer-to-peer engine that can run its own crawlers to index content, and query other peers for their content.

Searx aggregates different search engines. YaCy is peer-to-peer engine that can run its own crawlers to index content, and query other peers for their content. Looks like Searx has YaCy-integration available, so you could run a local YaCy-node and get its results added to your Searx results.