Snow Plow license
Snowplow is copyright 2012-2013 Snowplow Analytics Ltd.
Significant portions of the Snowplow JavaScript Tracker are copyright 2010 Anthon Pang.
License
The Snowplow JavaScript Tracker is largely based on Anthon Pang's piwik.js, the JavaScript tracker for the open-source Piwik project, and is distributed under the same license as piwik.js, Simplified BSD.
Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.
Third-party, git-submoduled contributions
The loosely-coupled architecture of Snowplow makes it easy to swap out individual sub-system implementations for first- or third-party alternatives. For example, in place of the CloudFront Collector, you can use the Scala Stream Collector.