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

• Software as a Service (SaaS)
  Všechny platformy Windows Mac Linux Chrome OS Android iPhone iPad Android Tablet Kindle Fire Web Software as a Service (SaaS) Windows Mobile iOS Microsoft Office Powerpoint WebGL Moodle
• Licence Open Source
  Jakákoli licence Bezplatná licence Licence Open Source Komerční licence