Version 9.5.1 of Icon is available in source and binary form. For details about the changes in this version, see the release notes.
Icon runs on Unix-like systems, including Linux, BSD, and Macintosh. Icon can run within the Cygwin environment on Microsoft Windows.
Documentation is on line:
Precompiled binaries are available for the Unix systems listed below. These binaries are built with graphics enabled, so the X Window system must be present on the target platform. Each package includes the translator, interpreter, interface builder, and library procedures. To install Icon from binaries,
Binary packages are 1.5 MB gzipped tar files.
gunzip <file.tgz | tar xf –.
The source code package for version 9.5.1 is a 3.1 MB gzipped tar file that includes the complete Icon program library. It can be configured for most Unix platforms including Cygwin and Darwin. Download icon-v951src.tgz.
The current source code, including all changes since June of 2013, is maintained as a public Git repository hosted by GitHub. Source code packages include build instructions and other current documentation.