из серверов у меня в домашней сети используется вот это:
BNBT was written by Trevor Hogan. BNBT is a complete port of the
original Python BitTorrent tracker to C++ using the STL for data storage
and basic network sockets for network communication. BNBT is fast,
efficient, customizable, easy to use, powerful, and portable. BNBT is
covered under the GNU Lesser General Public License (LGPL).
WWW:
http://bnbt.sourceforge.net/