Open Source Gmail Alternatives

The best open source alternative to Gmail is Proton Mail. If that doesn't suit you, our users have ranked more than 100 alternatives to Gmail and many of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Gmail are Tuta Mail, Disroot, Posteo and Infomaniak kMail.

filter to find the best alternatives

Most Gmail alternatives are WebMail Providers, but you can also narrow the list to Email Clients or Calendar Apps. Other popular filters are Free, Open Source, Android, EU and Linux. You can also filter for EU-based alternatives if you prefer software from the European Union.
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Alternatives
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Alternatives list

  1. NOCC icon

    NOCC

     5 likes

    NOCC is a webmail client written in PHP. It provides webmail access to IMAP and POP3 accounts.

    Cost / License

    • Free
    • Open Source

    Application type

    Since

    • Since 2010

    Platforms

    • Online
    NOCC inbox view
    Good alternative?
     
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