ScummVM is a 'virtual machine' for several classic graphical point-and-click adventure games. It is designed to run Adventure Soft's Simon the Sorcerer 1 and 2, Revolution's Beneath A Steel Sky, and games based on LucasArts' S.C.U.M.M (Script Creation Utility for Maniac Mansion) system. S.C.U.M.M is used for many games, including Monkey Island, Day of the Tentacle, Sam and Max and more.
Website:
http://www.sebelinteractive.de/scummvm/