Alternativas ao Wassapp para Software as a Service (SaaS) com licença gratuita

• Software as a Service (SaaS)
  Todas as plataformas Windows Mac Linux Android iPhone Windows Phone Blackberry Blackberry 10 Apple Watch Android Wear iPad Android Tablet Kindle Fire Windows S Web Self-Hosted Software as a Service (SaaS) Firefox Opera BSD Windows Mobile Haiku PortableApps.com FreeBSD S60 Chrome Telegram WhatsApp Messenger
• Licença gratuita
  Qualquer licença Licença gratuita Licença Open Source Licença comercial