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A group of gamers reverse engineered the network protocol used by Battle.net and Blizzard games, and released a free (under the GNU GPL) Battle.net emulation package called bnetd.
TetraVex is also available as an open source game on the GNOME desktop as part of the GNOME Games collection under GNU GPL.
It is licensed under the terms of the GNU LGPL and GNU GPL, with the bulk of the software (e.g., liblzma) in the public domain.