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Software · Office & notes

penguin-mail

Mail and calendar for Linux and macOS. Gmail and IMAP accounts, Google Calendar, contacts, OpenPGP and S/MIME. GTK4 and libadwaita, written in Rust.

  • Completely free
  • macOS and Linux
  • Open source
  • No account

Overview

Services and protocols mentioned: IMAP and SMTP.

Overview written by LicitPro from the documentation published by the authors and the cited sources; we have not tried the resource ourselves.

At a glance

All of penguin-mail is free: no feature is locked behind a paid plan, and its code is open.

Its licence (GPL-3.0) is a copyleft open source licence: you may use, study, modify and redistribute it, including commercially; modified versions must keep the same licence.

Strengths

  • Open source code
  • No account needed
  • Commercial use allowed

Sources and checks

  • Facts collected from GitHub (credit card, account, source code, publisher, licence, free status, platforms, commercial use) —
  • Last technical check: 7 November 2026
  • Description from github.com — Dépôt GitHub c9dev/penguin-mail (GPL-3.0-only)

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