OmegaT.app includes the following software in binary form.

JavaAppLauncher, part of appbundler
License: GNU Public License, version 2
See OmegaT.app/Contents/Java/lib/gpl-2.0.txt
Source available at https://bitbucket.org/infinitekind/appbundler

Java Runtime Environment
License: Oracle Binary Code License Agreement for the Java SE Platform
Products and JavaFX
See http://www.oracle.com/technetwork/java/javase/terms/license/index.html
