[span style=\'font-size:21pt;line-height:100%\']ScummVM! [/span]
As far as I am concerned it is the best thing since sliced cheese and no Zaurus is complete without it.
It's an interpretor for the old LucasArts graphic adventures like Sam & Max, Indiana Jones, Day of the Tentacle, Full Throttle, Maniac Mansion and Monkey Island. They also extended it to Simon the Sorceror, Broken Sword, Inherit the Earth, Gobliiins, Beneath a Steel Sky and Flight of the Amazon Queen. The publishers also those last two games also made them available for free download on the ScunnmmVM site so you can enjoy them without searching eBay or your attic/basement.
Finally, the ScummVM team is currently working on adding support to it for some of the Sierra games (like the early King's Quest, Space Quest, Police Quest and Leisure Suit Larry), Legend of Kyrandia, and I Have No Mouth and I Must Scream which should be done for Version 1.0. They are currently at 0.9.1 and pdaxrom has 0.9.0
here. Get it now before the Three-Headed Monkey gets you.