BitThief is a BitTorrent client developed by Distributed Computing Group at ETH Zurich, it offers torrent downloads without uploading (seeding). Its simply cheats the BitTorrent protocol, allowing it's users to download like a selfish giant. You may get better download speed with BitThief on well seeded torrents and slow internet connection (you will be able to use your full bandwidth for download), though just imagine if everybody starts using BitThief then the torrent itself will be dead.
BitThief poses a great threat to BitTorrent Peer 2 Peer (P2P) file sharing and can be considered as a torrent leeching client software. The point raised by the developers of BitThief is “We argue that the BitTorrent protocol has to be modified in order to effectively prevent selfishness.”
To use BitThief you must have Java Runtime Environment (JRE) installed, because BitThief is Cross-platform and written in Java.
Get latest version of Java Runtime Environment (JRE).