Armadillo adventure is an adventure game set within a world. It is a codebase, a toolkit for making your own adventures such as King's Quest. The toolkit has an example adventure program that can be easily changed and enlarged by derivation. If you are more interested in dungeoneering games, take a look at the <a href="http://freshmeat.net/projects/tanirs-quest/">Tanir's Quest</a> project.
Uldramar is a fantasy RPG and adventure game. You can cast spells like the mushroom morph spell and pick up objects for later use. The story is about a plane called Uldramar where there is a quest or two waiting for you. The game was influenced by the Ultima series and the Legend of Zelda.
I have added a macos X version and meta server code for relocatable scheme bootstrap objects. The framework is in place, still a few serving bugs left. See http://tullarisc.xtreemhost.com/monkey-0.10.0-mac.tgz .