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.
OTRS is an Open source Ticket Request System (also well known as trouble ticket system) with many features to manage customer telephone calls and e-mails.