[AChimp]

If I recall correctly, Lucasarts said that they'd never release their version of the SCUMM engine, but I imagine that you could figure some stuff out by using some of those programs FS listed.

The program I was thinking of was called the SCRAMM Project, which was supposed to be an independent copy of the SCUMM engine. You were supposed to be able to make your own games that would be compatible the SCUMM stuff, but I don't think it was ever released. :/