BitTorrent Inc. has released its implementation of uTP open source, under the MIT license.
It can be found here: http://github.com/bittorrent/libutp
We're hoping that this will encourage more bittorrent client developers to support uTP.
Here's the blogpost: http://blog.bittorrent.com/2010/05/21/Â … mentation/
There's also an (almost complete) implementation of uTP in libtorrent at:
http://libtorrent.svn.sourceforge.net/v … rrent_utp/ ( src/utp_stream.cpp )