VisBio is free software, distributed under the GNU General Public License (GPL). VisBio's source code is freely available.

The GPL allows you to make as many copies of the software as you want, and even create derivative works of the software, as long as those works are also distributed according to the GPL's terms. However, it prohibits using any of VisBio's code in a commercial product, so that VisBio and all derivative works remain free for everyone to use.