GNU Smalltalk is developed and routinely tested under Linux and Darwin (the kernel of Mac OS X), and should run under most Unix systems (as well as under Windows, using Cygwin). A native port to Windows is in progress.
I am just wondering about the status of native Windows port. I recently got really interested in Smalltalk and would like to see Windows port. I can help if needed.
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GNU Smalltalk is part of the GNU Project.