I found this on the Adventuredevelopers.com forums. The apparition of ScummC, a compiler with ScummVM 6 binary code as target, has stirred the waters a bit. The ScummVM project is one of the most visible and recognised adventure-related projects at the moment. Being able to develop for this platform is quite interesting of course.
G33k on the Adventuredevelopers forums found OpenQuest, which is an open source game made in AGS, to act as a demonstration game. The idea is to port this game in ScummC to have a reference and test the functionality of the compiler. It isn’t much of a game, as the story seems to be lacking.