The implementation of Icon is highly portable. Icon programs also are highly portable. The original implementation of Icon for UNIX was done at The University of Arizona. Most of the other implementations originally were done by volunteers scattered around the world. This contributes to the portability of Icon itself, as well as to the portability of programs written in Icon. 7.
Work is constantly underway on implementations of Icon for new platforms.
Present projects include Microsoft Windows, Windows NT, and a new Macintosh implementation. Icon has evolved through a series of versions with improved and extended capabilities. The latest major version number is 9. Other implementations presently are at Version 8. Almost all programs that run under Version 8 and that do not use graphics will run under Version 9. 9.