Zoomable user interface (ZUI) with file manager, file viewers and more
General Purpose Engine for Graphic Adventures.
Delphi Java - VRCalc++ OOSL (Script) and + (Binary Exec Distro)
An open source C++ console based game (Windows only).
Nurikabe, a great game.
microQuestMaker64 is a simple adventure creator for the Commodore 64