AlphaX is the Mac OS X native version of Alpha, developed by the AlphaCabal. It runs on Mac OS X 10.4 or later. It is very easy to upgrade AlphaX's embedded AlphaTcl library via SVN. Unlike previous beta versions of AlphaX, there is no need to download and install the "Tcl" software library separately. Each flavor listed above is upwards compatible, i.e. the Panther version should also work in Tiger.