Alternativas ao Ubivox para Facebook Messenger com licença comercial

• Facebook Messenger
  Todas as plataformas Windows Mac Linux Android iPhone Apple Watch iPad Android Tablet Windows S Web Self-Hosted Software as a Service (SaaS) Python BSD Windows Mobile Wordpress Facebook Facebook Messenger Solaris Amazon SES (Simple Email Service)
• Licença comercial
  Qualquer licença Licença gratuita Licença Open Source Licença comercial