Alternativ till SlideMail för Apple Watch med öppen källkodslicens

• Apple Watch
  Alla plattformar 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)
• Open Source-licens
  Eventuell licens Gratis licens Open Source-licens Kommersiell licens