ScummVM is a classic gaming interpreter and emulator that includes several interpreters for 2D adventures. There is currently support for several interpreters: AdventureSoft (Simon the Sorcerer 1/2), Revolution Software's Beneath a Steel Sky (not yet playable), and a SCUMM interpreter capable of running classic LucasArts and Humongous adventure games using the SCUMM/SPU engine. This includes titles such as Monkey Island, Day of the Tentacle, Sam and Max, The Dig, and more.
Note: While the software is classified as free, it is actually donationware. Please consider making a donation to help support development.