osTicket is a widely-used open source support ticket system. It seamlessly integrates inquiries created via email, phone and web-based forms into a simple easy-to-use multi-user web interface. Manage, organize and archive all your support requests and responses in one place while providing your customers with accountability and responsiveness they deserve. osTicket is an attractive alternative to higher-cost and complex customer support systems; simple, lightweight, reliable, open source, web-based and easy to setup and use. The best part is, it's completely free.