Submitted Dave Astle, Feb 22 2005 08:28 PM | Last updated Feb 22 2005 08:28 PM
An object-oriented programming language designed in the early days of Xerox PARC. Popular for its powerful English-like syntax and array of features only now coming to other programming languages (such as Java and C#).
More information can be found here.
It is extremely unpopular in game development, particularly due to the lack of large corporate backing -- it is nonetheless a good environment for learning and playing with the extremely powerful API.