New version of Adventure Maker
Adventure Maker is an easy-to-use toolkit to create adventure games similar to Myst or Riven. Version 3 of Adventure Maker has been released and introduces many new features, such as new realtime transitions between scenes (alphablending, slide...), 7-channel sound, the possibility to distribute games over more than on CD and support for VBScripts (although the author says it is still possible to create very complex puzzles without any scripting).
For more information on Adventure Maker go to the official website.