Nodekit
The software running on the Tagtool is the Nodekit - an open source node-based toolkit for live performance drawing & animating. It is licensed under the GNU GPL 2.0. Development is hosted on Launchpad.
If you want to contribute to the software development in any way, please contact us at info@tagtool.org!
The latest version (for Windows) and the source code are available for download.

