Alternatívy k službe MailTag pre všetky platformy s licenciou s otvoreným zdrojom

• Všetky platformy
  Všetky platformy Windows Mac Linux Chrome OS Android iPhone Android Wear iPad Android Tablet Web Self-Hosted Software as a Service (SaaS) Firefox Opera Safari Chromium Vivaldi Browser Microsoft Office Outlook Chrome Gmail Dropbox Brave HubSpot Streak CRM Yesware Boomerang Mailtrack for Gmail: email tracking E-mail Follow-Up Reply FollowUpThen Rebump Followup.cc
• Licencia Open Source
  Akákoľvek licencia Bezplatná licencia Licencia Open Source Obchodná licencia