Zammad
95 · HealthyTicketing and helpdesk system with email, chat, phone and social channels in one view.
3 open source projects replace Zoho Desk, ranked by how safe each is to depend on.
Ticketing and helpdesk system with email, chat, phone and social channels in one view.
Ticketing system with SLAs, a customer portal, canned responses and a knowledge base, built on the Frappe framework.
Veteran PHP support-ticket system that routes inquiries from email, web forms and phone.

Health and license are separate verdicts: a project can be well maintained and still not be open source.
| Project | Health | License | Stars |
|---|---|---|---|
| Zammad | 95 · Healthy | Free, share hosted changesAGPL-3.0 | 6.0k |
| Helpdesk | 76 · Stable | Free, share hosted changesAGPL-3.0 | 3.4k |
| osTicket | 54 · Caution | Free, share changesGPL-2.0 | 4.0k |
Zoho Desk is a paid helpdesk & live chat product. See all open source helpdesk & live chat tools, ranked the same way.
Scores last refreshed from GitHub on 9 October 2026. How we score.