While ScummVM is the go-to emulator for LucasArts adventure games these days, there’s another one people should consider using. DREAMM is an emulator focused on LucasArts games that relies on low-level emulation instead of reverse engineering, providing a more accurate emulation of these games over ScummVM. The emulator was created by Aaron Giles, who previously worked at LucasArts and created many of the Mac ports for their games. You can hear him discuss the emulator here.
In addition to it providing more accurate emulation for LucasArts adventure games, having a focus on LucasArts games means it supports a lot of games ScummVM never will, like Yoda Stories, Rebel Assault 2, and Mortimer and the Riddles of the Medallion. You can view the complete list of games it supports here.