Alternativy k Vmail pro Chrome OS s licencí open source

• Chrome OS
  Všechny platformy Windows Mac Linux Chrome OS Android iPhone Android Wear iPad Android Tablet Kindle Fire Windows S Web Self-Hosted Software as a Service (SaaS) Windows Mobile Java Mobile S60 Android TV Chrome OpenPGP
• Licence Open Source
  Jakákoli licence Bezplatná licence Licence Open Source Komerční licence