ILWIS 3.4 Open
As per July 1st, 2007, ILWIS software is freely available ('as-is' and free of charge) as open source software (binaries and source code) under the 52°North initiative (GPL license). This software version is called ILWIS 3.4 Open.
Please note that ILWIS support by ITC has been stopped. For support, go to the ILWIS discussion list at the 52°North web page.