MAME is now Free and Open Source Software

The MAME (Multiple Arcade Machine Emulator) project has announced a license change, moving from the old, unique "MAME License" to the GNU GPLv2-or-later for the full codebase, with many individual components available under the 3-clause BSD License. The announcement notes that a considerable effort went into the relicensing process: "We have spent the last 10 months trying to contact all people that contributed to MAME as developers and external contributors and get information about desired license." The old license [Wayback link] had prohibited commercial sale and use.