BigSense, BigSenseTester and LtSense are all licensed under the GNU GPL v3 License.

    BigSense and LtSense are free software: you can redistribute them and/or modify
    them under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    BigSense and LtSeense are distributed in the hope that they will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.