AGAST, an adventure game creation engine. Ready to use, with demos and a manual, although still under development.

SCRAMM, an adventure game creation engine without a working demo or a tentative release date

Zak McKracken 2 Project, a second episode of the great Zak McKracken adventure. Made by fans but REALLY good setup and graphics.

Will Spiritual Robots Replace Humanity by 2100? ... I hope so.