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...

Client IT documentation, ticketing, invoicing and accounting for MSPs (Managed Service Providers)