Minerva Project
URL = http://www.mpi-inf.mpg.de/departments/d5/software/minerva/index.html
""Each peer is considered autonomous and has its own local search engine with a crawler and a corresponding local index. Peers share their local indexes (or specific fragments of local indexes) by posting meta-information into the P2P network. This meta-information contains compact statistics and quality-of-service information, and effectively forms a global directory. However, this directory is implemented in a completely decentralized and largely self-organizing manner." (cited in http://www.readwriteweb.com/archives/p2p_potential_future_applications.php)