Krawlerx
Krawler is a P2P-based search engine that sits on your desktop and searches the PC's of your friends and associates as well. It allows content creation.
URL = http://www.krawlerx.com/index.html
Commentary:
"Krawler[x], termed as âSocial Collaboration Networkâ? (change that to Learn, Share, Done), is a tool that lets one setup personal networks, create, find and publish content, and find new people to network with - all this with the ease of a desktop client.
P2P Search. Krawler[x] search reaches the innards of Office Files (doc/ppt/xls), Acrobat Files (.pdf) and the regular stuff like HTML and Text Files; which means that one can efficiently full-text search within files shared on a network(shared through Krawler[x]). The search being distributed, queries propagates rapidly through the P2P network and provide amazing speed." (http://shashark.wordpress.com/2006/01/02/krawlerx-p2p-20-anyone/)