µTorrent (Micro Torrent)
A very efficient client, using less than 6MB of memory and a tiny amount of processing power, µTorrent runs quietly in the background and offers all the functionality you would expect from an advanced client, including Protocol Encryption , bandwidth prioritization, and download scheduling.
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ABC (Yet Another BitTorrent Client)
Based on the BitTornado client with added features such as managing multiple transfers from a single window, automatic seeding and queuing.
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BitComet
Powerful and easy to use, BitComet is a C++ based client that supports simultaneous downloads, download queue, fast-resume, speed limits, port mapping and many other features.
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Burst
A lightweight client which lets you manage multiple downloads from a single window, plus many other features such as a .torrent creation-tool and a built-in Log/Stats facility.
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Mac OS X
Tomato Torrent
This alternative to the official OS X client is based on the original but offers a more OS X like feel. Features include download statistics, AppleScript support and customizable options. The developers of this client wanted to separate the BitTorrent and Mac code so that either could be updated independently.
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Bits on Wheels
Completely written in Objective-C and Cocoa , this is the first 100% Native BitTorrent client for the Mac. It supports multiple simultaneous downloads, and provides real-time updates concerning your peers as they send or receive blocks from you.
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Transmission
A free, versatile client with an efficient and intuitive interface. Transmission provides plenty of functionality without any feature bloat, and is free for anyone to use or modify.
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BT++
An improved Torrent client, written in Python and wxPython for maximum cross-platform compatibility. Features include multiple downloads in a single window, and automatic re-starting of interrupted downloads without the need for the .torrent file.
Homepage - Download
Linux/Unix
ABC (Yet Another BitTorrent Client)
Based on the BitTornado client with added features such as managing multiple transfers from a single window, automatic seeding and queuing.
Homepage - Download
Transmission
A free, versatile client with an efficient and intuitive interface. Transmission provides plenty of functionality without any feature bloat, and is free for anyone to use or modify.
Homepage - Download
BT++
An improved Torrent client, written in Python and wxPython for maximum cross-platform compatibility. Features include multiple downloads in a single window, and automatic re-starting of interrupted downloads without the need for the .torrent file.
Homepage - Download
Java
Azureus
This fully featured Java client incorporates a GUI with extensive visualizations/statistics about the current transfers. It supports multiple concurrent downloads and can be fine-tuned to your liking.
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Snark
As well as being a BitTorrent client, Snark also includes an integrated .torrent file creator, micro-HTTP server, and tracker. This enables users to share files with a single command, without having to install a tracker or find another one to upload the .torrent file to.
Homepage & Download