BTDigg is the first BitTorrent DHT

Distributed hash table

A distributed hash table is a class of a decentralized distributed system that provides a lookup service similar to a hash table; pairs are stored in a DHT, and any participating node can efficiently retrieve the value associated with a given key...

 search engine

Search engine

A search engine is an information retrieval system designed to help find information stored on a computer system. The search results are usually presented in a list and are commonly called hits. Search engines help to minimize the time required to find information and the amount of information...

.
It analyses the DHT

Distributed hash table

A distributed hash table is a class of a decentralized distributed system that provides a lookup service similar to a hash table; pairs are stored in a DHT, and any participating node can efficiently retrieve the value associated with a given key...

 network in the real-time and provides
full-text search over active torrents in European and Asian languages.
Site name is acronym from BitTorrent Digger.

Features

BTDigg monitors the DHT network and crawls the most popular torrents. It provides public API to investigate
the amount of DHT queries for the torrent by providing its info hash.
Also there are search plugins for web browser

Web browser

A web browser is a software application for retrieving, presenting, and traversing information resources on the World Wide Web. An information resource is identified by a Uniform Resource Identifier and may be a web page, image, video, or other piece of content...

s (Firefox, IE, Google Chrome

Google Chrome

Google Chrome is a web browser developed by Google that uses the WebKit layout engine. It was first released as a beta version for Microsoft Windows on September 2, 2008, and the public stable release was on December 11, 2008. The name is derived from the graphical user interface frame, or...

) and qBittorrent

Qbittorrent

qBittorrent is a free software cross-platform BitTorrent client GUI written with Qt4. The program uses libtorrent-rasterbar C++ library for the torrent back-end functionality. It is developed by Christophe Dumez, from the University of Technology of Belfort-Montbeliard in France...

client.