Alternatives à SlideMail pour Self-Hosted avec licence open source

• Self-Hosted
  Toutes les plateformes 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)
• Licence Open Source
  Toute licence License gratuite Licence Open Source Licence commerciale