Alternativy k Mailbox for Zoho pro Windows s licencí open source

• Windows
  Všechny platformy Windows Mac Linux Chrome OS Android iPhone Apple Watch iPad Android Tablet BSD Haiku PortableApps.com F-Droid Ubuntu GNOME Arch Linux Fedora OpenPGP S/MIME
• Licence Open Source
  Jakákoli licence Bezplatná licence Licence Open Source Komerční licence