YaCy
YaCy is a free, peer-to-peer, decentralised search engine. Instead of relying on a central server, YaCy peers each run a network node that crawls and indexes the web, sharing results with the whole peer network — meaning search results come from a community-controlled index with no single point of failure or central censorship.
Key Features
- Fully decentralised — No central server; the network is formed by user-run peers
- Distributed indexing — Each peer crawls independently and shares its index with the network
- Privacy friendly — Search requests are distributed and not tracked by a central provider
- Ranked results — Relevance ranking across a community-moderated index
- Intranet search — Index your own local network, files and documents
- Open protocol — Anyone can run a peer and contribute to the network
Why Use YaCy?
YaCy is unique in that it puts a genuinely decentralised search index in your hands. If you care about an internet search that is not dominated by a single company and want to contribute to a common, open index, running a YaCy peer is a practical way to take part — while also giving you a private intranet search tool.
Use Cases
- Privacy-focused community and decentralised web search
- Intranet / private network document indexing
- Contributing to an open, community-owned web index
- Educational demonstrations of peer-to-peer systems
Platform
Linux · macOS · Windows (Java-based)
Licence
GPL-2.0