Adventure Game Studio is a free game engine that can be used to create your own point-n-click style adventure games, ala Myst, King's Quest, Maniac Mansion, Sam & Max, etc. While the AGS program itself is only for Windows, it is capable of creating games that can also run on other platforms. It has been used to create retail games, such as Gemini Rue, Resonance and the Blackwell games. It was also used to re-master some classic adventure games such as King's Quest 1 & 2. It has its own community that creates a number of interesting indie games that are released for free. A solid engine option for someone looking to create their own adventure games. Also just interesting for the games community members make.