YaCy (ya see) is a free distributed search engine, built on principles of peer-to-peer (P2P) networks. Developed by Michael Peter Christen et al.
License: Open Source
regain is a search engine similar to web search engines like Google, with the difference that you don't search the web, but your own files and documents. Using regain you can search through large portions of data (several gigabytes!) in split seconds. Developed by Til Schneider and Thomas Tesche
License: Open Source
YaCy is a decentralized, open-source search engine focused on privacy and community-driven content, whereas Regain offers AI-powered search capabilities with a more user-friendly interface and personalization features.