Owen made available the source code related to our recent WWW 2007 workshop paper Tag-Cloud Drawing: Algorithms for Cloud Visualization. It should run fine under MacOS and Linux. Firefox needed. There is a mix of Java code and C code. Take your pick: lemur-tagging-0.0.zip or lemur-tagging-0.0.tar.gz. This include the source code and it should run under Linux and MacOS. A port to Windows is not difficult to achieve.