Squeak is an open, highly-portable Smalltalk-80 implementation whose virtual machine is written entirely in Smalltalk, making it easy to debug, analyze, and change. To achieve practical performance, a translator produces an equivalent C program whose performance is comparable to commercial Smalltalks.

This file contains version 3 of the Squeak "sources file", a repository of code that all version 3.x images can refer to. The rest of the code that an image refers to, must be included in the "changes file" that is distributed along with the image.