Open Source Alternatives to Gmail

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Mailspring

Desktop email client with productivity superpowers

★ 17,900 Updated: Oct 2026 Status: Active
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Roundcube

Browser-based IMAP email client

★ 7,209 Updated: Oct 2026 Status: Active
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RainLoop Webmail

Simple, modern web-based email client

★ 4,113 Updated: Aug 2024 Status: Archived
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WebMail Lite

Lightweight webmail front end for IMAP servers

★ 457 Updated: Nov 2019 Status: Inactive