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Calypso

Calypso is primarily a multi-user, multi-channel reservations system with a wide range of customer and technology driven features and functionalities. subtitle

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Top 4 Open-Source Alternatives to Calypso

SOGo Baïkal Radicale

Product categories

Email Email Clients Network & Admin SMTP Server Self-hosted Email

Summary

The top open-source alternatives to Calypso are SOGo, Baïkal, and Xandikos. One of the criteria for ordering this list is the number of mentions that products have on reliable external sources. You can suggest additional sources through the form here.
  1. SOGo Landing Page
    SOGo Landing Page
    1

    SOGo

    SOGo is groupware server with a focus on scalability and open standards.
    Pricing:
    • Open Source

    #Email #Email Clients #Self-hosted Email 1 social mentions

  2. Baïkal Landing Page
    Baïkal Landing Page
    2

    Baïkal

    Cal and CardDAV server
    Pricing:
    • Open Source

    #Network & Admin #Email #Email Clients 22 social mentions

  3. Xandikos Landing Page
    Xandikos Landing Page
    3
    X

    Xandikos

    Lightweight CalDAV/CardDAV server on top of Git.
    Pricing:
    • Open Source

    #Network & Admin #Email #Email Clients

  4. Radicale Landing Page
    Radicale Landing Page
    4

    Radicale

    The Radicale Project is a complete CalDAV (calendar) and CardDAV (contact) server solution.
    Pricing:
    • Open Source

    #Email #Email Clients #Network & Admin 15 social mentions

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If you think we've missed something, please suggest an alternative to Calypso.
Please use the Feedback button if you think any of the listed products shouldn't be regarded as open-source.

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