All Synse components are licensed under the GPL-3.0 license.

Briefly, that means that:

You may copy, distribute and modify the software as long as you track changes/dates in source files. Any modifications to or software including (via compiler) GPL-licensed code must also be made available under the GPL along with build & install instructions.

-- tldrleagal

For the full licenses, see the LICENSE file found in each project's source repo.