µTorrent (or uTorrent and commonly abbreviated as " µT " or " uT ", pronounced "micro torrent") is a freeware, closed source BitTorrent client by BitTorrent, Inc. It is available for Microsoft Windows and Mac OS X. Both versions are written in C++. It gets the "µ" in its name from the SI prefix "micro" meaning one one-millionth and it refers to the program's small footprint. The program is designed to use minimal computer resources while offering functionality comparable to larger BitTorrent clients such as Vuze or BitComet.
The program has received consistently good reviews for its feature set, performance, stability, and support for older hardware and versions of Windows. A report showed that µTorrent is the most used BitTorrent client and the second most popular P2P application. BitTorrent, Inc. claims that there are at least 28 million unique users using µTorrent per month.
The program has been in active development since its first release in 2005. Although originally developed by Ludvig Strigeus, since December 7, 2006 the code is owned and maintained by BitTorrent, Inc. The code has also been employed by BitTorrent, Inc. as the basis for version 6.0 of the BitTorrent client, a re-branded version of µTorrent.
Features
Early development
Out of general discontent with bloatware, Serge Paquet suggested to Ludvig Strigeus that he should make a small and efficient BitTorrent client. Strigeus began to conceptualize the plans for the program's development, which, at the time, did not include making the client feature-rich. After initially working on it for about a month during the last quarter of 2004 (the first build is dated October 17, 2004), mostly during his free time before and after work, Strigeus ceased coding µTorrent for a year. He resumed work on September 15, 2005, and three days later, the first public release (version 1.1 beta) was made available as freeware, and began generating feedback.
Advertisements
In early versions, Strigeus had built in a web redirection via nanotorrent for search queries entered through the search bar that displayed advertisements in a frame on the web browser. Some users thought this suspicious because tracking could be implemented by recording the IP addresses of those downloading/receiving the advertisements, and the search functionality could easily be used to track user queries through whichever web-interface the client is going through to execute the search. After a short trial period, the advertising was disabled, mitigating possible concerns.
A later version of the software has, instead of ads, a "search all sites" feature, which is a keyword-based search bar that delivers listings of torrent files at different trackers. A frame at the top displays advertisements (server-side) in the browser when the search function is used. In version 1.5, no ads are present in the program itself.
As of build 463, a redirect bypass feature became available in the Advanced options.
PeerFactor SARL
On March 4, 2006, PeerFactor SARL announced the signing of a six-month contract with Strigeus for the development of "new content distribution applications on the Web." PeerFactor SARL is a relatively new company formed by former employees of PeerFactor, which was a subsidiary of the French anti-piracy organization Retspan.
Ludde stated that his coding for PeerFactor SARL was to use his expertise at optimization of the BitTorrent protocol to create a .dll which PeerFactor SARL intended to use as part of a distribution platform for files in a corporate setting. At the time there was some speculation that μTorrent may have been modified to spy on users on Peerfactor's behalf, however to date (even following μTorrent's acquisition by BitTorrent, Inc.) no evidence has been produced to support these allegations.
Ownership change
On December 7, 2006, µTorrent was purchased by BitTorrent, Inc., as it was announced on their official forum. µTorrent will continue to have its own website and community for now, and the µTorrent code base will remain closed source. Ludvig Strigeus, the writer of µTorrent, will serve as a technical consultant, but BitTorrent, Inc. will do the majority of the development work.
On September 18, 2007, BitTorrent 6.0 was released, which is a re-branded version of µTorrent. As a result, BitTorrent 6 is closed-source (unlike BitTorrent 5.x and before, which were open source software) and is currently only available for Windows.
Mac version
A separate version of µTorrent for Mac OS X 10.5 (commonly abbreviated as " µMac ") has been in development for years. As of November 27, 2008 a beta version (Intel x86 and PPC) is available for download on a separate section of the website.
Ask.com toolbar
As of version 1.8.2, the µTorrent installer gives the user the option to download and install the Ask.com toolbar. This is done on the first run of the program and the user may explicitly opt-out of this feature by deselecting it. The developers stated the addition was needed for funds to continue development.
Release history
Pronunciation
The author of µTorrent wrote in 2005, "I usually say 'you torrent' because it looks like a u", and offered "microtorrent", "mytorrent" (as "my" is the Swedish pronunciation of the greek letter µ) and later "mutorrent" as candidate pronunciations. The symbol μ, which is actually the small Greek letter Mu, stands for the SI prefix "micro" meaning one one-millionth and refers to the program's small footprint.
Easter eggs
- If you open the About screen ("Help" > "About µTorrent") and then press the "T" key, it will start a built-in tetris game called µTris.
- Clicking the µTorrent logo in the About screen will play a synthesized sound similar to Deep Note.
Contributors
Original development was performed by Ludvig Strigeus ("ludde", from Sweden), the creator of µTorrent. Serge Paquet ("vurlix", from Canada) acted as release coordinator, and had intended to work on Linux and Mac OS X ports. He maintained the µTorrent website and forum up until the end of 2005, but is no longer affiliated with µTorrent.
Development after the purchase by BitTorrent is performed by developers Greg Hazel ("alus"), Arvid Norberg ("arvid", author of libtorrent), Jan Brittenson ("CodeRed"), Richard Choi ("rchoi") and Ryan Norton ("RyanNorton") at BitTorrent Inc. Strigeus remains as a technical consultant.
Other tasks continue to be performed by ongoing contributors. Giancarlo Martínez ("Firon", from Puerto Rico) maintains the µTorrent forums and FAQ. Carsten Niebuhr ("Directrix", from Germany) developed and maintains the µTorrent Web User Interface. Timothy Su ("ignorantcow", from Malaysia) is the designer of the current website.
Features
Features present in µTorrent include:
- µTorrent can use as little as 14 MB of RAM running on a 486 processor on Windows 95.
- Unicode support for Windows 95/98/ME, avoiding use of the Microsoft Layer for Unicode which is several times larger than µTorrent.
- Teredo / IPv6 support.
- UDP Torrent Protocol preliminary support as of 1.8.2 with full-support coming in 2.0
- UPnP support for all versions of Windows, without needing Windows XP's UPnP framework.
- Protocol encryption (PE),
- Peer exchange (PEX) with other BitTorrent clients,
- libtorrent and clients based on it like Deluge have full µTorrent PEX support.
- Transmission and clients based on libTransmission have full µTorrent PEX support.
- KTorrent has full µTorrent PEX support as of 2.1 RC1.
- Vuze, formerly Azureus, has full support as of version 3.0.4.3
- RSS ("broadcatching").
- "Trackerless" BitTorrent support using DHT, compatible with the original BitTorrent client and BitComet.
- User configurable intelligent disk caching system.
- Full proxy server support.
- HTTPS tracker support.
- Configurable bandwidth scheduler.
- Localized for 52 languages.
- Initial seeding of torrents.
- Customizable search bar & user interface design
- Configuration settings and temporary files are stored in a single directory, allowing portable use.
- WebUI - A plugin currently in beta testing that allows µTorrent running on one computer to be controlled from another computer, either across the internet or on a LAN, using a Web page.
- Embedded Tracker - a simple tracker designed for seeding torrents, lacking a web interface or list of hosted torrents. It is not designed for secure or large-scale application.
- Quick-resumes interrupted transfers
Size
µTorrent is shipped as a single stand-alone compressed executable file, and does not require installation through an installer, which is available for trivial installation. Recent versions have included the ability to install t
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