XenViewer is a handy remote access tool. It allows you to quickly, easily, and securely access the Guest OSs on your XenServer system from outside your network. No VPN required.
XenViewer Features:
1. Access your XenServer Guest OSs without setting up a VPN
2. Automatically retrieves a list of Guest OSs
3. No extra password setup involved - uses standard host authentication
4. Uses ssh encryption over a single port to reduce network configuration requirements.

Limitations:
* 10 days trial

The license of this software is Free Trial Software, the price is $19.95, you can free download and get a free trial.