Open Source Horde Alternatives

    The best open source alternative to Horde is Roundcube. If that doesn't suit you, our users have ranked more than 25 alternatives to Horde and 19 is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Horde are Rainloop (Free, Open Source), Mailpile (Free, Open Source), mailcow: dockerized (Free, Open Source) and Zimbra Collaboration Suite (Freemium, Open Source).

    This page was last updated Apr 22, 2021

      • FreeOpen Source
      • Online
      • Self-Hosted
      Open Source WebMail Lite is a free community edition of full-featured WebMail Pro server application intended for users who need a clean and simple web mail application, which is fast and easy to use.
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    1. All your E-mail, from all your accounts, in one place. Cypht is like a news reader, but for E-mail. Cypht does not replace your existing accounts - it combines them into one. And it's also a news reader :).


      • FreeOpen Source
      • Mac
      • Windows
      • Linux
      Unofficial, free and open-source Google Inbox Desktop App. Built using electron, Inboxer includes a menu bar which is globalmenu compatible and works, and keyboard shortcuts.

      Discontinued

      Project archived. See https://github.com/denysdovhan/inboxer/issues/101

    2. Online Collaboration with Chat and Online Office. Is developed as open source software in Germany, offered as free community version and as commercial version. Operation as self-hosted or as SaaS from the computer centre.
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    3. NOCC is a webmail client written in PHP. It provides webmail access to IMAP and POP3 accounts.
      No screenshots yet


    4. OBM is a free messaging and collaboration platform useful for just a couple to many thousands of users with strong support for mobile devices.

      Discontinued

      The GitHub repository has been archived and the last update was in 2017.

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    5. NeoMail is a web-based mail client that allows users to access their mail spools and send messages. It does not require a POP3 server, or any shell access for the users. It interfaces directly with user mail spools.
    6. Postaci (Turkish for Postman) is multiplatform Webmail software which is database independent, multilanguage, POP3/IMAP, and fully MIME-compatible.

      Discontinued

      Last commit on github : Jan 12, 2015. See https://github.com/Postaci-Webmail/Postaci

      No screenshots yet
    7. Afterlogic Aurora is an enterprise collaboration system for small and medium-sized business. Aurora provides collaboration of webmail, contacts, calendar, files and helpdesk modules.
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    Showing 19 of 19 alternatives