Alternativa articleboxu za Google Calendar z brezplačno licenco

• Google Calendar
  Vse platforme Windows Mac Linux Chrome OS Android iPhone Android Wear iPad Android Tablet Windows S Web Self-Hosted Software as a Service (SaaS) BSD Electron / Atom Shell Chrome Google Calendar
• Brezplačna licenca
  Vsako dovoljenje Brezplačna licenca Open Source licenca Trgovsko dovoljenje