Zammad

Flexible web-based ticketing system used for customer service, help desk, IT service management

Simple, easy to use help desk & knowledge base software. Custom branding, custom themes, restful...

All-in-one mail server with JMAP, IMAP4, and SMTP support and a wide range of modern features

Email-based customer support application, help desk and shared mailbox

Helpdesk software which helps you streamline your company's support, offers an easy setup, clean...

Enterprise-grade issue tracking system