<p><a href="https://github.com/anacrolix/go-libutp">https://github.com/anacrolix/go-libutp</a>, docs <a href="http://godoc.org/github.com/anacrolix/go-libutp">http://godoc.org/github.com/anacrolix/go-libutp</a>. Alternative to my pure Go implementation <a href="https://github.com/anacrolix/utp">https://github.com/anacrolix/utp</a>. Currently used in production, and as the default if cgo is enabled in <a href="http://github.com/anacrolix/torrent">http://github.com/anacrolix/torrent</a>.</p>
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