After a period of inactivity due to some legal wrangling between LucasArts and ScummVM.org, a new version of the open source implementation of LucasArt's S.C.U.M.M. (Script Creation Utility for Maniac Mansion) interpreter has been released. This package allows you to play classic games such as Monkey Island, Indiana Jones, Day of the Tentacle, Sam and Max and many more ... on your SGI.
Marcus Herbert has compiled and packaged a IRIX binary (MIPS3 static). If you have any problems downloading the file let me know and I'll host it here as well. The source code is available at the ScummVM website, along with non-IRIX binaries. Have fun!