The license under which ggobi is distributed is open source. That means you can use it free of charge, modify the code and even sell it. It is the license under which AT&T is distributing some of its non-commercial software.
There are several pieces of software that are involved in the ggobi system, both on which it depends and which depend on it. These are released under the following different licenses
Embeddable ggobi library
|Common Public License|
|Rggobi||GNU Public License|
|Mersenne Twister pseudo-random number generator||BSD License|