Alternativas ao PlanPlusOnline para Software as a Service (SaaS) com licença de código aberto

• Software as a Service (SaaS)
  Todas as plataformas Windows Mac Linux Android iPhone iPad Web Self-Hosted Software as a Service (SaaS) Windows Mobile Microsoft Office Outlook Chrome Microsoft Office Suite
• Licença Open Source
  Qualquer licença Licença gratuita Licença Open Source Licença comercial