Probatron4J is a command-line executable JAR for Java 1.5 or later.
Probatron4J is licensed under the GNU Affero General Public License, Version 3. You can browse the source code at Google Code.
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To build from source you will need an installation of Apache Ant. Get the source code for a release or check out the current working copy from the Google Code Subversion repository. Then "ant jar" to build the executable jar.