µTorrent,

µTorrent, or uTorrent (see ) is a owned and developed by  With over 100 million users it is the most widely used BitTorrent client outside China; globally only behind  The "U" (Greek letter "mu") in its name comes from the ", referring to the program's small  the program was designed to use minimal computer resources while offering functionality comparable to larger BitTorrent clients such as  The program has received consistently good reviews for its feature set, performance, stability, and support for older hardware and versions of Windows.

The program has been in active development since its first release in 2005. Although originally developed by 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 and above of the  a re-branded version of µTorrent. All versions are written in C++.Out of general discontent with Serge Paquet suggested to that he should make a smaller and more 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  and began generating feedback.

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 

Ludde stated that his coding for PeerFactor SARL was to use his expertise at optimization of the BitTorrent  to create a  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 bitronrt, as it was announced on their official forum.

On September 18, 2007,bitrornt 6.0 was released. Although previous versions of the BitTorrent client had been  it has been closed source since version 6.

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