To unzip the source:

tar -xvzf workspace-2008-03-11.tgz

To build jar files for application and applet

cd workspace-2008-03-11/annotation/argo
ant build

jars with be in

workspace-2008-03-11/annotation/dist/argo/argo.jar
workspace-2008-03-11/annotation/argo/argo-applet-unproguarded.jar

run as

java -jar argo.jar

or double click.