Alternativa SlideMailu za BSD z brezplačno licenco

• BSD
  Vse platforme Windows Mac Linux Chrome OS Android iPhone Apple Watch Android Wear iPad Android Tablet Windows S Web Self-Hosted BSD Haiku PortableApps.com Slack F-Droid Chrome Ruby Gmail Cloudron Amazon Echo (Alexa Voice Service) PureOS (Purism)
• Brezplačna licenca
  Vsako dovoljenje Brezplačna licenca Open Source licenca Trgovsko dovoljenje