Alternatívy programu CloudEmail.io pre S/MIME s licenciou s otvoreným zdrojom

• S/MIME
  Všetky 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
• Licencia Open Source
  Akákoľvek licencia Bezplatná licencia Licencia Open Source Obchodná licencia