Thanks for your interest in JFLAP!
We are distributing both the JFLAP source and binary under the JFLAP 7.0 license, available in the file LICENSE.
Summary of the license: The license text must be included in any distribution of JFLAP. Any distribution of JFLAP or any work that includes it modified or unmodified must be available free of charge.
Please send us feedback as to how you ended up using JFLAP, as well as any changes you would like to see in the official version. Please send this to email@example.com
We are working on setting up a version controlled repository, so that more people can get more directly involved in the development of JFLAP.
Once this is up, we will announce it on www.jflap.org, together with details on how to become a privileged contributor with commit rights.
If you are interested in participating, please keep an eye on the website, or email firstname.lastname@example.org indicating this interest.