Zammad vs Kayako
Kayako alternative build for every kind of team.

Kayako is a helpdesk with a strong focus on classic multichannel customer service. It offers solid features for customer support teams handling day-to-day tasks.
Zammad takes a broader and more flexible approach. As an open-source helpdesk, Zammad is generally more adaptable and cost-effective—especially for teams that value self-hosting, data sovereignty, and long-term flexibility. Designed for customer support, IT service desks, and even solopreneurs, Zammad supports internal and external communication across any industry and company size.
Read the Flownative story I actually know them all: OTRS, Zendesk, Jira, Freshdesk, RequestTracker... we used Kayako for a while, but after the company was bought out, we looked around for an alternative for privacy reasons. That's where Zammad, as an open-source solution, is ideal, of course.
Zammad was built with teams like yours in mind. Have a look at the features of Zammad compared with Kayako:

Sound promising? If you're currently using Kayako but casting wistful looks at Zammad now, your time has come! As of Zammad version 5.1, a new Kayako migration wizard will make the switch easier than ever before. It allows you to import your existing Kayako data right into a new Zammad instance at the touch of a button, meaning that you can take all your existing files with you and pick up right where you left off. And if you get stuck, we're right here to help. What are you waiting for?
Note: Unfortunately, the Migrator is not available for Kayako Classic, the self-hosted version of the system.