Wikipedia
ShareReactor was an index site for files on the eDonkey network and Torrent files. ShareReactor did not host any files; instead, the links it contained were accessible through an eDonkey network and BitTorrent client. The site was taken down by Swiss Police on March 10, 2004 due to the suspicion of breach of copyright and trademark laws. After a long downtime of nearly two years and six months, the site returned online under new ownership. However nearly two months after its return it once again closed down due to lack of popularity. On December 2008 the site was reopened once more brought back to life with help from the Pirate Bay team. Its notability is still known today as a search on any p2p network will show many thousands of files tagged with Sharereactor in their name.
ShareReactor delivers links that can be used together with a P2P client program that understands eD2k links or torrent files.