Hello!
I have found:
User-friendly help desk system
Trellis
Desk is a powerful, robust help desk solution for your business.
Improve your company's service by allowing your customers to quickly
and easily submit support tickets to your team. Trellis Desk sports a
range of advanced features to revitalize the way your business handles
customer support. Even better, it's completely free; you don't have to
pay any license fees to use Trellis Desk.
URL: http://www.accord5.com/trellis
DEMO: http://demo.accord5.com/trellis
Looks nice