Zimbra Collaboration Suite
Zimbra Collaboration is an open, secure collaboration tool for email, calendaring, tasks and more.
18 Alternatives To Zimbra Collaboration Suite
Kerio Connect
KerioConnect is a commercial mail and groupware server.
Kolab Community
Kolab Groupware is a secure, scalable, reliable, flexible, full-featured collaboration suite.
MDaemon Messaging Server
Low cost, easy to use Email Server software for virtual, on-premise, or hosted deployments for…
Mail-in-a-box
Mail-in-a-Box provides webmail and an IMAP/SMTP server for use with mobile devices and desktop mail software and also includes contacts and calendar synchronization.
Mailpile
Mailpile is a modern, fast web-mail client with user-friendly encryption and privacy features.
Microsoft Exchange Server
Microsoft Exchange Server is a messaging and collaborative software product developed by Microsoft.
Zentyal
Linux directory, domain, mail, gateway and infrastructure server for SMBs.
mailcow dockerized
An open source mailserver suite.