Zimbra
Zimbra is an open-source email and collaboration platform that provides email, calendar, contacts, and task management services. It offers both on-premises and cloud-based deployment options, featuring a web-based interface and support for desktop clients via protocols like IMAP and CalDAV. The platform is widely used by businesses, educational institutions, and service providers for its robust features and scalability.
Developers should learn Zimbra when building or maintaining email and collaboration systems for organizations that require self-hosted or customizable solutions, such as enterprises, schools, or ISPs. It is particularly useful for scenarios involving integration with existing infrastructure, custom plugin development, or providing a feature-rich alternative to commercial email platforms like Microsoft Exchange.