Alternativa Clockwork SMSu za Software as a Service (SaaS) sa besplatnom licencom

• Software as a Service (SaaS)
  Sve platforme 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)
• Besplatna licenca
  Bilo koja licenca Besplatna licenca Licenca otvorenog koda Komercijalna licenca