FrostWire is a free Gnutella and bittorrent client based on LimeWire distributed under terms of the GPL. FrostWire available for Windows, Mac OSX and Linux. The bittorrent engine in FrostWire has got a major overhaul in this release.
Changes in version 4.20.1 “Torrent Joint”
Major Upgrade: BitTorrent Engine replaced for a lightweight version of the Azureus BitTorrent core.
FrostWire has become a far superior BitTorrent client starting version 4.20.x now supporting:
Trackerless Torrents (via Azureus DHT)
Improved Magnet link support (BTIH Magnet Links)
+100% Faster Torrent Connection Bootstraping (No more “sources needed” for some .torrents)
+100% Faster Torrent Downloads in some ocassions than 4.18.x
Transport Encryption capabilities
Improved UPnP implementation
New Feature: The Download Manager now has a new column showing the amount of bytes downloaded per download.
Update: The “Refresh Connections” Tool is now available even if you are Turbo Charged.
Fixes a bug where Crash Reports would always show an old version number.