Kolab Groupware
GroupwareOpen-source groupware server with mail and calendaring
Replaces Microsoft Exchange, Zimbra
1 self-hosted Zimbra alternatives
Zimbra is a popular proprietary tool in the groupware space. These open-source apps let you replace Zimbra with software you host and control yourself.
Best self-hosted Zimbra alternatives
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Switching from Zimbra
Moving off Zimbra means trading a managed subscription for a service you run yourself. The payoff is ownership: no per-seat pricing, no vendor lock-in, and full control of your data. Start with the option above that matches your setup-difficulty comfort level — every app links to a detailed specs page and head-to-head comparisons.