Alternativ till Clockwork SMS för Software as a Service (SaaS) med gratis licens

• Software as a Service (SaaS)
  Alla plattformar Windows Mac Linux Chrome OS Android iPhone Windows Phone iPad Android Tablet Windows S Web Self-Hosted Software as a Service (SaaS) PHP JavaScript Windows Mobile Java Apple TV C++ Objective-C C (programming language)
• Gratis licens
  Eventuell licens Gratis licens Open Source-licens Kommersiell licens