EGroupware is the enterprise ready open source software for your teamwork. It manages emails, contacts, todos, appointments, and more for your whole business.
Lacks available extensions or plugins, and extending functionality requires custom programming.
Management of content and data is relatively straight forward, but there may be a bit of a learning curve. Some programming experience may be required.
Has a smaller active community. Limited support is available either for free or as a paid service. Adequate documentation is available.
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