Open source support ticket system simple, free, lightweight, open source, and easy to setup and use. Developed by osTicket
License: Open Source
Desk.com is a cloud-based customer service platform with a strong integration with Salesforce, making it ideal for businesses already using Salesforce. osTicket, being an open-source solution, offers extensive customization and is more cost-effective, but may require more technical expertise to set up and manage.