Developer website: Swiki
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. The image above was created in Squeak, and illustrates several of Squeak's abilities, including the ability to scale and rotate bitmap images at any color depth, anti-aliased TrueType fonts and vector graphics.
Version 5.4b2: Release notes were unavailable when this listing was updated.
Mac OS X 10.5 or later