yacy-distributed open source search engine based on peer

YaCy is a peer-based distributed web search engine system, anyone can use yacy for themselves to establish a personal search portal, in order to achieve the free sharing of information. After 5 years of development, the YaCy team released the 1.0 version of this open source, distributed search engine in November 2011.  　　   　　This version is licensed under the GPL and is designed to replace some of the current traditional search services, such as Google, that are centrally hosted by a company. The core is a computer program called Yacy-peer, distributed on hundreds of computers, which forms the YaCy network based on the peer-network, the entire network is a decentralized architecture, all peers are in a peer position, there is no unified central server, and each peer crawls the internet independently. 　　 　　Analyze and set up the index library and share it through peer-network; Each peer is also a standalone proxy server that can index the Web pages used by the computer, and query and return results from a Web server running on its own, which will collate its own independent search indexes and rankings. YaCy is also an HTTP cache proxy server that can search your own or global indexes, crawl your own web pages, or start distributed crawling. 　　YaCy can be used for local search on LAN. 　　 　　YaCy search engine mainly consists of five parts, in addition to the common search engine has a crawler, indexer, anti-sorting index library, it also includes a very rich search and management interface and for data sharing of peer network. 　　YaCy uses a variety of mechanisms to protect the privacy of users, YaCy network based on point-to-point connections, rather than through a central server for search queries, to ensure that content is not reviewed, and all search requests are encrypted, search results will not be recorded and analyzed by the central server. YaCy provides Windows, Linux, Mac OS version of the program for download, under Windows is an EXE file, directly installed, that can be searched. YaCy the first version has been released, currently 1.4 billion documents have been indexed and 130,000 searches have been completed. 　　Professional scientific search engine sciencenet is also based on yacy technology. This address: http://playkid.blog.163.com/blog/static/562872602014815111228800/