Most components of the source code for the Vuo Community Edition (including the compiler, editor, and SDK) are under the GNU Lesser General Public License (LGPL) version 2 or later.
The source code for non-Pro nodes and the example compositions are under the MIT License.
The binary (Vuo.app) and Pro features are under the Vuo Proprietary License. Actions permitted with the Community Edition app and Vuo Pro app are listed on the FAQ "What actions are permitted under my Vuo license?".