Alternativy k Bookis pro Software as a Service (SaaS) s licencí open source

• Software as a Service (SaaS)
  Všechny platformy Windows Mac Linux Chrome OS Android iPhone Windows Phone iPad Android Tablet Web Self-Hosted Software as a Service (SaaS) PHP jQuery Windows Mobile Slack Microsoft Office Outlook Chrome Google Calendar Sunbird Google Apps Microsoft Exchange Server Apple Calendar
• Licence Open Source
  Jakákoli licence Bezplatná licence Licence Open Source Komerční licence