Alternativas ao Snooze Your Email for Gmail para Gmail com licença de código aberto

• Gmail
  Todas as plataformas Windows Mac Linux Chrome OS Android iPhone Web Self-Hosted Firefox Microsoft Office Outlook Chrome Thunderbird Apple Mail Gmail Sparrow Mail Pilot Acompli Mailbox FastMail
• Licença Open Source
  Qualquer licença Licença gratuita Licença Open Source Licença comercial