Wikipedia
Torrentz
Torrentz was a Finland-based meta-search engine for BitTorrent that was run by an individual known as Flippy. It indexed torrents from various major torrent websites, and offered compilations of various trackers per torrent that were not necessarily present in the default .torrent file, so that when a tracker was down, other trackers could do the work. It was the second most popular torrent website in 2012 and again in 2015.