Alternativy k CloudEmail.io pro PureOS (Purism) s bezplatnou licencí

• PureOS (Purism)
  Všechny platformy Windows Mac Linux Chrome OS Android iPhone Blackberry Blackberry 10 Apple Watch Android Wear iPad Android Tablet Kindle Fire Windows S Web Self-Hosted Software as a Service (SaaS) Windows Mobile Java Mobile F-Droid S60 Android TV Chrome MetaMask OpenPGP PureOS (Purism) S/MIME DAVdroid
• Bezplatná licence
  Jakákoli licence Bezplatná licence Licence Open Source Komerční licence