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.

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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
Gmail alternatives page was last updated

Alternatives list

  1. Galae icon
     1 like

    Galae is a secure email service focused on deliverability, self-management and interoperability. It totally relies on free/libre opensource software.

    59 Galae alternatives

    Cost / License

    Application type

    Since

    • Since 2025

    Platforms

    • Online
    • Software as a Service (SaaS)
    Good alternative?
     
  2. systemli.org icon
     5 likes

    Systemli.org is a left network and technics-collective that was founded in 2003. Our aim is to provide safe and trustworthy communication services. The project addresses political activists and people who have a particular need to protect their data.

    27 systemli.org alternatives

    Cost / License

    • Free
    • Open Source

    Since

    • Since 2017

    Platforms

    • Online
    Good alternative?
     
  3. Webmail Lite icon
     18 likes

    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. Whether you need a free web browser based email client software for Windows ASP.

    Cost / License

    Application type

    Since

    • Since 2011

    Platforms

    • Online
    • Self-Hosted
    Good alternative?
     
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  4. Keychat icon
     2 likes
    • Senders send messages stamped with Bitcoin ecash to Nostr relays. The Nostr relays collect the Bitcoin ecash, then deliver messages to receivers.

    Cost / License

    Application type

    Since

    • Since 2025

    Platforms

    • Android
    Good alternative?
     
  5. Fripost icon
     6 likes

    Fripost – the Free Email Association. Fripost organize the people who want an alternative to "free" e-mail services where you are constantly under surveillance and personal data is handed over to third parties.

    Cost / License

    • Paid
    • Open Source

    Application type

    Since

    • Since 2014

    Platforms

    • Online
    Good alternative?
     
  6. Iroco icon
     1 like

    Opensource email which cares about your privacy. Developed and hosted in France.

    Cost / License

    • Paid
    • Open Source

    Application type

    Since

    • Since 2025

    Platforms

    • Online
    Good alternative?
     
  7. Criptext icon
     10 likes

    Finally, an email service that's built around your privacy. Get your @criptext.com email address and see what it's like to have peace of mind and privacy in every email you send.

    Cost / License

    • Free Personal
    • Open Source

    Application type

    Since

    • Since 2018

    Alerts

    • Discontinued

    Platforms

    • Windows
    • Mac
    • Linux
    • Android
    • iPhone
    Good alternative?
     
  8. Developed to assist small/medium sized business for business emails just like Gmail or Outlook.

    Cost / License

    • Paid
    • Open Source

    Application type

    Since

    • Since 2017

    Platforms

    • Windows
    • Mac
    • Linux
    Good alternative?
     
  9. Sinka icon
     Like

    Fan one Gmail inbox out to many team inboxes. IMAP APPEND copies, never forwards: no send limits, no shared passwords. Runs on your machine or on Cloudflare's edge.

    Cost / License

    • Free
    • Open Source (MIT)

    Since

    • New

    Platforms

    • Linux
    • Self-Hosted
    Good alternative?
     
  10. Open-source email for growing teams. Deploy on your own infrastructure, connect your domain, and manage your organization’s email without a software subscription for every employee.

    Cost / License

    • Free
    • Open Source (MIT)

    Application type

    Since

    • New

    Platforms

    • Self-Hosted
    • Cloudflare
    Good alternative?
     
  11. Curier icon
     Like

    A native macOS email client with a "tweetdeck" like view of inboxes. Currently, it only supports Gmail, with the potential to support other email services in the future. Built with Tauri and React.

    Cost / License

    • Free
    • Open Source (MIT)

    Application type

    Since

    • New

    Platforms

    • Mac
    Good alternative?
     
  12. Inboxer icon
     3 likes

    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.

    Cost / License

    • Free
    • Open Source (MIT)

    Application type

    Since

    • Since 2018

    Alerts

    • Discontinued

    Platforms

    • Windows
    • Mac
    • Linux
    Good alternative?
     
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