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

• Software as a Service (SaaS)
  Todas as plataformas Windows Mac Linux Chrome OS Android iPhone Windows Phone Blackberry Blackberry 10 iPad Android Tablet Windows S Web Self-Hosted Software as a Service (SaaS) Solaris Raspbian
• Licença gratuita
  Qualquer licença Licença gratuita Licença Open Source Licença comercial