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Top Open Source Email Clients Tools in 2026

A curated collection of the 4 best free and open-source Email Clients tools in 2026. Compare features, GitHub stars, tech stacks, and self-hosted software.

  • Inbox Zero

    AI email assistant to reach inbox zero fast

    Stars
    12,094
    Last commit
    11d ago
    License
    Open Source

  • UnInbox

    Collaborative email for teams to get work done

    Stars
    1,757
    Last commit
    6mo ago
    License
    Open Source

  • Twake Mail

    Open source secure professional email solution

    Stars
    648
    Last commit
    10d ago
    License
    AGPL-3.0

  • Macro Mail

    AI-powered unified inbox for faster email management

    Stars
    4,064
    Last commit
    11d ago
    License
    AGPL-3.0
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Showing 4 of 4 open-source tools