Alternativer til PlanPlusOnline til Software as a Service (SaaS) med open source-licens

• Software as a Service (SaaS)
  Alle platforme Windows Mac Linux Android iPhone iPad Web Self-Hosted Software as a Service (SaaS) Windows Mobile Microsoft Office Outlook Chrome Microsoft Office Suite
• Open Source-licens
  Enhver licens Gratis licens Open Source-licens Kommerciel licens