Alternativas ao Zyptonite para Software as a Service (SaaS) com licença gratuita

• Software as a Service (SaaS)
  Todas as plataformas Windows Mac Linux Android iPhone Windows Phone Blackberry Apple Watch Android Wear iPad Android Tablet Windows S Web Software as a Service (SaaS) BSD Windows Mobile Haiku PortableApps.com FreeBSD
• Licença gratuita
  Qualquer licença Licença gratuita Licença Open Source Licença comercial