Unity is the most popular and supported platform for GestureWorks. GestureWorks supports three different use cases for Unity:
Source code for a sample illustrating these modes is in the GestureWorks 2 install at Samples\Unity\UnityGestureWorksDemo.
In addition to the larger sample the following are guided tutorials explaining setting up GestureWorks for Unity:
Unity Hello World
Unity Interactive Bitmaps